1993 Lincoln Mark VIII rough under 1000rpm/30mph, great at

Tiny
TOOMANYCARSTOFIX
  • MEMBER
  • 1993 LINCOLN MARK VIII
  • V8
  • 2WD
  • AUTOMATIC
  • 115,000 MILES
STILL LOOKING FOR SUGGESTIONS OF THINGS TO CHECK THAT MIGHT CAUSE THIS ROUGH RUNNING PROBLEM as none were given in the response
Fixed egr tube problem, new sensor/solenoid thing, replaced both coils, wires, and plugs. Got some improvement--no longer stalls at idle. However, engine VERY rough from 0-30mph approximately, and up to 1000 or 1500rpm--at higher speeds, smoothe as can be, runs great then. But not driveable around town at this point. Main code we get now is 565 cannister purge solenoid-circuit failure, which we replaced but code still comes up. What does circuit failure mean, and how do we find the actual problem? (Check engine light still comes on immediately after all repairs so far) continuous memory code 238 still comes up but we replaced both coils. And what might cause that rough rough running at low speeds that might not show up as a code? How to check those things? I donated once, and was told I could get more help, but haven't figured out how. So donating smaller amount this time. How do I make follow up questions--never able to find anything except to send to general free answer area. Thank you!
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Monday, April 27th, 2009 AT 11:25 AM

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Tiny
MERLIN2021
  • EXPERT
For code 565 pay particular attention to #6 in these instructions.
CIRCUIT TEST KD - CANISTER PURGE (CANP) Diagnostic Aids Perform this test when instructed by QUICK TEST or if directed by other test procedures. This test is only intended to diagnose: CANP solenoid. " Harness circuits (CANP and VPWR). " Powertrain Control Module (PCM). "


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1) Check System Function Use only VOM or DVOM for this step. DO NOT use scan tester. Turn ignition off. Disconnect cruise control servo wiring harness connector. Connect DVOM negative lead to STO terminal at Data Link Connector (DLC). Connect positive lead to positive battery terminal. Install a jumper wire between STI terminal and SIG RTN terminal at DLC. See Fig. 26 -22. Perform KOEO SELF-TEST until continuous memory test is complete. DVOM will read less than 1.0 volt when test is complete to indicate PCM has entered OUTPUT STATE CHECK. Depress and release throttle. If voltage increases, remain in OUTPUT STATE CHECK and go to step 2). If voltage does not increase, depress throttle to WOT and release. If STO voltage does not increase, leave test equipment hooked up and go to CIRCUIT TEST QC. 2) Check CANP Solenoid Electrical Function Turn ignition on. Disconnect CANP solenoid. Connect DVOM positive test lead to VPWR terminal and negative test lead to CANP terminal at solenoid wiring harness connector. While observing DVOM, depress and release throttle several times to cycle output on and off. If CANP circuit voltage does not cycle 0.5 volt or more, remove jumper wire and go to step 7). If CANP circuit voltage cycles, remain in OUTPUT STATE CHECK and go to step 3). 3) Check Solenoid For Vacuum Leaks Turn ignition on. Leave CANP solenoid disconnected. Disconnect vacuum hose at CANP solenoid from manifold vacuum side of solenoid. Apply 16 in. Hg vacuum to manifold vacuum side of CANP solenoid. If CANP solenoid does not hold vacuum for 20 seconds, replace solenoid and repeat QUICK TEST. If fault is still present, service fuel evaporation canister or hoses. If CANP holds vacuum for 20 seconds, remain in OUTPUT STATE CHECK, leave vacuum pump attached and go to step 4). 4) Check Solenoid Mechanical Operation Connect CANP solenoid connector. Apply 16 in. Hg vacuum to manifold vacuum side of CANP solenoid. Depress and release throttle. If vacuum is released, check hose from CANP solenoid to canister for leaks and cracks. If hose is okay, remove jumper wire from STI to SIG RTN and go to step 5). If vacuum is not released, check hose from CANP solenoid to canister for blockage or kinks. If hose is okay, replace CANP solenoid and repeat QUICK TEST. 5) Check Vacuum Supply To CANP Solenoid Disconnect vacuum hose from CANP solenoid on manifold vacuum side. Start engine. If vacuum is present at vacuum hose, engine control system is okay. Check evaporative canister. If vacuum is not present at hose, check vacuum hose for improper routing, kinks and blockage. If hose is okay, check engine for mechanical cause of low vacuum. 6) Code 85/565 Or 569: Check CANP Solenoid Resistance Code 85/565 or 569 indicates fault in CANP solenoid circuit. Possible causes for this fault are: Faulty CANP solenoid. " Open or short circuit in wiring harness circuit. " Faulty PCM. " Turn ignition off. Disconnect CANP solenoid connector. Measure CANP solenoid resistance. If resistance is 40-90 ohms, go to step 7). If resistance is not 40-90 ohms, replace CANP solenoid and repeat QUICK TEST. 7) Check Voltage Of VPWR Circuit With CANP solenoid disconnected, turn ignition on. Measure voltage between VPWR terminal at CANP solenoid harness connector and negative battery terminal. If reading is 10.5 volts or more, go to step 8). If reading is less than 10.5 volts, repair open circuit and repeat QUICK TEST. 8) Check Continuity Of CANP Circuit Turn ignition off. Disconnect CANP solenoid. Disconnect 60-pin PCM connector. Inspect terminals, and repair if damaged. Install Breakout Box (T83L-50-EEC -IV), leaving PCM disconnected. Measure resistance between CANP circuit breakout box test pin (No. 11, 15 or 31) and CANP harness connector. If reading is less than 5 ohms, go to step 9). If reading is 5 ohms or more, repair open circuit and repeat QUICK TEST. 9) Check CANP Circuit For Short To Ground Turn ignition off. With CANP solenoid disconnected, measure resistance between CANP circuit breakout box test pin (No. 11, 15 or 31) and pins No. 40, 46 and 60. If all readings are 10,000 ohms or more, go to step 10). If any reading is less than 10,000 ohms, repair short to ground and repeat QUICK TEST. 10) Check CANP Circuit For Short To Power Turn ignition off. With CANP solenoid and PCM disconnected, measure resistance between CANP circuit breakout box test pin and test pins No. 37 and 57. If all readings are 10,000 ohms or more, replace PCM and repeat QUICK TEST. If any reading is less than 10,000 ohms, repair short to power and repeat QUICK TEST.
PINPOINT TEST D: CODE 215, 216, 217 OR 238 Check For Spark During Cranking Using a spark tester, check for spark at all spark plug wires while cranking. If spark is consistent on all spark plug wires, ignition system is okay. Go to H - EEC-IV TESTS W/O CODES article in the ENGINE PERFORMANCE Section. If spark is not consistent, go to step 2). 1. Check For Spark At Right Spark Plug Wires During Cranking If spark is consistent at all right spark plugs (one spark per crankshaft revolution), go to step 3). If spark is not consistent, go to step 19). 2. Check Left Spark Plugs & Wires Check left spark plug wires for insulation damage, looseness, shorting and other damage. Remove and check left spark plugs for damage, wear, carbon deposits and incorrect plug gap. Ensure connectors and plug wires are attached to left coil pack. If spark plugs and wires are okay, reinstall plugs, and go to step 4). If spark plugs or wires are defective, service or replace damaged components as necessary. 3. Check For PWR To Left Coil With ignition off, connect EI diagnostic cable to breakout box. Connect left coil tee. Connect EI diagnostic cable negative lead to battery. Use EI "8" overlay on breakout box. Set EI cable box switch to 8 CYLINDER position. Set DVOM on 20-volt DC scale. With ignition on and engine off, measure voltage between J11 (COIL PWR L) and J7 (BAT-) at breakout box. If DC voltage is greater than 10 volts, go to step 5). If voltage is 10 volts or less, repair open in COIL PWR circuit to left coil. 4. Check C3 At Coil Pack With ignition on and engine off, measure voltage between J10 (LC3C) and J7 (BAT-) at breakout box. If DC voltage is greater than 10 volts, go to step 6). If voltage is 10 volts or less, go to step 13). 5. Check C4 At Coil Pack With ignition on and engine off, measure voltage between J18 (LC4C) and J7 (BAT-) at breakout box. If DC voltage is greater than 10 volts, go to step 7). If voltage is 10 volts or less, go to step 15). 6. Check C3 At ICM With ignition off, connect ICM tee to ICM and wiring harness connector. With ignition on and engine off, measure voltage at breakout box between J54 (LC3I) and J7 (BAT-). If voltage is more than 10 volts, go to step 8). If voltage is 10 volts or less, repair open C3 circuit in harness. 7. Check C4 At ICM With ignition on and engine off, measure voltage between J55 (LC4I) and J7 (BAT-) at breakout box. If DC voltage is greater than 10 volts, go to step 9). If voltage is 10 volts or less, repair open C4 circuit in harness. 8. Check C3 At Coil Connector With ignition off, disconnect left coil pack from coil tee. Leave EI diagnostic cable connected to wiring harness connector. With ignition on and engine off, measure voltage between J10 (LC3C) and J7 (BAT-) at breakout box. If DC voltage is less than 0.5 volt, go to step 10). If voltage is 0.5 or greater, go to step 17). 9. Check C4 For Power At Coil Connector With ignition on and engine off, measure voltage at breakout box between J18 (LC4C) and J7 (BAT-). If DC voltage is less than 0.5 volt, go to step 11). If voltage is 0.5 volt or greater, go to step 18). 10. Check C3 At Coil Connector While Cranking With ignition off, connect positive lead of EI diagnostic cable to battery. Connect a test light between J1 (BAT +) and J10 (LC3C). Crank engine. If test light blinks consistently and brightly (one blink per revolution), go to step 12). If test light does not blink as specified, C3 circuit in module is open. Replace ICM. 11. Check C4 At Coil Connector While Cranking Connect a test light between J1 (BAT +) and J18 (LC4C). Crank engine. If test light blinks consistently and brightly (one blink per 12. revolution), input to coil pack is okay but high voltage output does not exist. Replace left coil pack. If test light does not blink as specified, C4 circuit in module is open. Replace ICM. Check C3 For Short To Ground If voltage was 10 volts or less in step 5), turn ignition off. Set DVOM on 20-k/ohm scale. Disconnect coil from coil tee. Leave EI diagnostic cable connected to vehicle coil connector. Measure resistance between J7 (BAT-) and J10 (C3C) at breakout box. If resistance is 2000 ohms or more, C3 circuit is open in coil. Replace left coil pack. If resistance is less than 2000 ohms, go to next step. 13. With ignition off, disconnect ICM from wiring harness. Measure resistance between J7 (BAT-) and J10 (C3C) at breakout box. If resistance is greater than 10,000 ohms, C3 circuit is shorted to ground internally. Replace ICM. If resistance is 10,000 ohms or less, repair short to ground in C3 circuit. 14. Check C4 For Short To Ground With ignition off, disconnect coil from coil tee. Leave EI diagnostic cable connected to wiring harness connector. Measure resistance between J7 (BAT-) and J18 (LC4C) at breakout box. If resistance is greater than 2000 ohms, C4 circuit is open in coil. Replace left coil pack. If resistance is 2000 ohms or less, go to step 16). 15. With ignition off, disconnect ICM from wiring harness connector. Measure resistance between J7 (BAT-) and J18 (LC4C) at breakout box. If resistance is greater than 10,000 ohms, C4 is shorted to ground internally. Replace ICM. If resistance is 10,000 ohms or less, repair short to ground in C4 circuit. 16. Check C3 For Short To Power With ignition off, disconnect ICM from diagnostic cable ICM tee. Leave EI diagnostic cable connected to wiring harness connector. Set DVOM to 20-volt DC scale. Measure voltage between J10 (LC3C) and J7 (BAT-) at breakout box. If DC voltage reading is less than 0.5 volt, C3 is shorted to power internally. Replace ICM. If voltage is 0.5 volt or greater, repair short to power in C3 circuit. 17. Check C4 For Short To Power With ignition on, disconnect ICM from diagnostic cable ICM tee. Leave EI diagnostic cable connected to wiring harness connector. Measure voltage between J18 (LC4C) and J7 (BAT-) at breakout box. If DC voltage reading is less than 0.5 volt, C4 is shorted to power internally. Replace ICM. If voltage is 0.5 volt or greater, repair short to power in C4 circuit. 18. Check Right Spark Plugs & Wires Check right coil pack spark plug wires for insulation damage, looseness, shorting and other damage. Remove and check right spark plugs for damage, wear, carbon deposits and improper plug gap. If spark plugs and wires are okay, reinstall plugs and wires, and go to step 20). If spark plugs and wires are defective, service or replace damaged components as necessary. 19. CAUTION: Never connect PCM to breakout box when performing EI diagnostics. Check For Right Coil PWR With ignition off, install EI diagnostic cable to breakout box. Connect negative lead to battery. Install right coil diagnostic cable tee. Use EI diagnostic "8" overlay on breakout box. Set EI cable box switch to 8 CYLINDER position. With ignition on and engine off, measure voltage between J5 (COIL PWR R) and J7 (BAT-) at breakout box. If DC voltage is greater than 10 volts, go to step 21). If voltage is 10 volts or less, repair open COIL PWR circuit in harness. 20. Check C1 Power At Coil Pack With ignition on and engine off, measure voltage between J3 (RC1C) and J7 (BAT-) at breakout box. If DC voltage is greater than 10 volts, go to step 22). If voltage is 10 volts or less, go to step 29). 21. Check C2 Power At Coil Pack With ignition on and engine off, measure voltage between J6 (RC2C) and J7 (BAT-) at breakout box. If DC voltage is greater than 10 volts, go to step 23). If voltage is 10 volts or less, go to step 31). 22. Check C1 Power At ICM With ignition off, install ICM tee to ICM and wiring harness connector. With ignition on and engine off, measure voltage at breakout box between J51 (RC1I) and J7 (BAT-). If DC voltage is greater than 10 volts, go to step 24). If voltage is 10 volts or less, repair open C1 circuit in harness. 23. Check C2 Power At ICM With ignition on and engine off, measure voltage between J27 (RC2I) and J7 (BAT-) at breakout box. If DC voltage is greater than 10 volts, go to step 25). If voltage is 10 volts or less, repair open C2 circuit in harness. 24. Check C1 Power At Coil Connector With ignition off, disconnect right coil from diagnostic cable coil tee. Leave EI diagnostic cable connected to wiring harness right coil connector. With ignition on and engine off, measure voltage at breakout box between J3 (RC1C) and J7 (BAT-). If DC voltage is less than 0.5 volt, go to step 26). If voltage is 0.5 volt or greater, go to step 33). 25. Check C2 Power At Coil Connector With ignition on and engine off, measure voltage between J6 (RC2C) and J7 (BAT-) at breakout box. If DC voltage is less than 0.5 volt, go to step 27). If voltage is 0.5 volt or greater, go to step 34). 26. Check C1 At Coil Connector - Cranking (Coil Disconnected) With ignition off, connect EI diagnostic cable positive lead to battery. Connect test light between J1 (BAT +) and J3 (RC1C). Observe test light while cranking engine. If light blinks consistently (one blink per engine revolution), go to step 28). If test light does not blink as specified, C1 circuit is open in module. Replace ICM module. 27. Check C2 At Coil Connector - Cranking (Coil Disconnected) Connect test light between J1 (BAT +) and J6 (RC2C). Observe test light while cranking engine. If light blinks consistently (one blink per engine revolution), input to coil pack is okay but high voltage output does not exist. Replace right coil pack. If test light does not blink as specified, C2 circuit is open internally. Replace ICM. 28. Check C1 For Short To Ground (Coil Disconnected) With ignition off, disconnect coil from coil tee. Leave diagnostic cable connected to wiring harness connector. Set DVOM on 20- k/ohm scale. Measure resistance between J7 (BAT-) and J3 (RC1C) at breakout box. If resistance is greater than 2000 ohms, C1 circuit is open in coil. Replace right coil pack. If resistance is 2000 ohms or less, go to step 30). 29. Check C1 For Short To Ground (Coil & ICM Disconnected) With ignition off, disconnect ICM from wiring harness. Measure resistance at breakout box between J7 (BAT-) and J3 (RC1C). If resistance is greater than 10,000 ohms, C1 circuit is shorted to ground internally. Replace ICM. If resistance is 10,000 ohms or less, repair short to ground in C1 circuit. 30. Check C2 For Short To Ground (Coil Disconnected) With ignition off, disconnect coil from coil tee. Leave EI diagnostic cable connected to wiring harness connector. Measure resistance between J7 (BAT-) and J6 (RC2C) at breakout box. If resistance is greater than 2000 ohms, C2 is open in coil. Replace right coil pack. If resistance is 2000 ohms or less, go to step 32). 31. Check C2 For Short To Ground (Coil & ICM Disconnected) With ignition off, disconnect ICM from wiring harness connector. Measure resistance between J7 (BAT-) and J6 (RC2C) at breakout box. If resistance is greater than 10,000 ohms, C2 is shorted to ground internally. Replace ICM. If resistance is 10,000 ohms or less, repair short to ground in C2 circuit. 32. Check C1 Power (Coil & ICM Disconnected) With ignition off, disconnect ICM from diagnostic cable ICM tee. Leave diagnostic cable connected to wiring harness connector. Set DVOM on 20-volt DC scale. With ignition on and engine off, measure voltage between J3 33. (RC1C) and J7 (BAT-) at breakout box. If DC voltage is less than 0.5 volt, replace ICM. If voltage is 0.5 volt or greater, repair short to power in C1 circuit. Check C2 Power (Coil & ICM Disconnected) With ignition off, disconnect ICM from diagnostic cable ICM tee. Leave diagnostic cable connected to wiring harness connector. With ignition on and engine off, measure voltage between J6 (RC2C) and J7 (BAT-) at breakout box. If DC voltage is less than 0.5 volt, replace ICM. If voltage is 0.5 volt or greater, repair short to power in C2 circuit. 34.
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Monday, April 27th, 2009 AT 2:47 PM

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