1995 Other Ford Models backfiring and loss of power

Tiny
JAC730
  • MEMBER
  • 1995 FORD
  • V8
  • 2WD
  • AUTOMATIC
  • 46,000 MILES
I have a motorhome with a ford drivetrain 460 motor. Recently I drove it after it sat for almost 2 years, I ran it frequently while in storage, but had a problem I took it camping it fan fine on the way there about 15 miles, but on the way back about 3miles it started to backfire and lost power, it would idle ok but when I tried to take off it would not go, so I had it towed back, when I got there I started it and it seem to run fine.3 years ago I had the fuel pump replace and it has very low miles on it maybe 200 at the most can someone help
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Friday, July 31st, 2009 AT 5:31 PM

8 Replies

Tiny
MERLIN2021
  • EXPERT
Is the 460 fuel injected, or carbeurated?
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Friday, July 31st, 2009 AT 6:02 PM
Tiny
JAC730
  • MEMBER
Fuel injected
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Friday, July 31st, 2009 AT 6:06 PM
Tiny
MERLIN2021
  • EXPERT
First check should be the fuel pump pressure, test as shown in the video at the end of this link.

http://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Friday, July 31st, 2009 AT 7:32 PM
Tiny
JAC730
  • MEMBER
It has a new fuel pump already in it
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Saturday, August 1st, 2009 AT 12:28 AM
Tiny
MERLIN2021
  • EXPERT
Ok sorry you did say that, I missed it! Now is the Motorhome distributorless, or does it have a distributor? If it has a distrib, need to look at cap wires, rotor, and IGN module. Also wires routed to the proper plugs, and not shorting(burn spots) anywhere. If no distributor, coilpacks need to be checked. Let me know which you have and I will get specs for you.
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Saturday, August 1st, 2009 AT 12:44 PM
Tiny
JAC730
  • MEMBER
No distributer
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Saturday, August 1st, 2009 AT 10:02 PM
Tiny
MERLIN2021
  • EXPERT
We need to read codes, here's how. BACKFIRES Preliminary Checks Check vacuum hose routing. Check spark plug wiring for incorrect firing order. Symptom Checks Perform the following: Check ignition system. See IGNITION SYSTEMS in appropriate appropriate I - SYSTEM & COMPONENT TESTING article below. Perform QUICK TEST. See appropriate TESTS W/CODES - EEC -IV article below. If code is present, perform appropriate CIRCUIT TEST. TESTS W/CODES - EEC-IV (4.9L) TESTS W/CODES - EEC-IV (5.0L) TESTS W/CODES - EEC-IV (5.8L) TESTS W/CODES - EEC-IV (7.5L) Check air injection (if equipped). See EMISSION SYSTEMS & SUB-SYSTEMS in appropriate I - SYSTEM & COMPONENT TESTING article below. Check engine mechanical condition. Check compression, intake manifold gasket, camshaft, valve train components, etc. Check fuel delivery system. See FUEL SYSTEM in appropriate appropriate I - SYSTEM & COMPONENT TESTING article. SYSTEM/COMPONENT TESTS - EEC-IV (4.9L) SYSTEM/COMPONENT TESTS - EEC-IV (5.0L) SYSTEM/COMPONENT TESTS - EEC-IV (5.8L) SYSTEM/COMPONENT TESTS - EEC-IV (7.3L DIESEL) SYSTEM/COMPONENT TESTS - EEC-IV (7.5L)RETRIEVING CODES Diagnostic trouble codes are retrieved from EEC-IV system through Data Link Connector (DLC). Various methods and test equipment may be used to access these codes: Analog Volt-Ohmmeter (VOM). Scan tester. Malfunction Indicator Light (MIL)/CHECK ENGINE light. STAR Series Tester DATA LINK CONNECTOR (DLC) LOCATIONS READING CODES KOEO & KOER SELF-TEST Codes PCM outputs codes one digit at a time. These codes indicate current faults in system and should be serviced in order of appearance. Use DIAGNOSTIC TROUBLE CODE REFERENCE CHART to identify correct CIRCUIT TEST. If using an analog voltmeter or CHECK ENGINE light or Malfunction Indicator Light (MIL), pay careful attention to length of pauses in order to read codes correctly. Digits in DTC will be displayed by a needle pulse sweep (analog voltmeter) or a flash (MIL). Diagnostic Trouble Codes (DTCs) are represented by a 3-digit number. For example, the first digit of DTC 312 would be displayed by 3 sweeps/flashes with a 0.4-second pause in-between each sweep/flash. A 2-second pause will occur between first and second digits of DTC. Second digit of DTC 312 will be displayed by one sweep/flash then another 2-second pause. Third digit of DTC 312 will be displayed by 2 sweeps/flashes with a 0.4 pause in-between each sweep/flash. A 4-second pause occurs between each code. See Fig. 1 . KOE O codes are separated from Continuous Memory codes by a 6 to 9-second delay, a 0.4-second sweep/flash (separator pulse) and then another 6 to 9- second delay. See Fig. 2 . Scan tester, if used, will count pulses and display them as a digital code. STAR tester cannot be used to read 3-digit codes. Super STAR II or New Generation STAR tester can be used to read 3-digit codes. If using Super STAR II tester, 3-digit codes will only be displayed in fast code mode. If slow code mode is used, display will be blank. CAUTION: Continuous Memory Codes should be recorded when retrieved. These codes may be used to identify intermittent problems that exist after all KOEO and KOER codes have been repaired and a Code 111 (pass code) has been obtained. Some Continuous Memory Code faults may not be valid after KOEO and KOER codes are serviced. Application Location All Models Left Rear Of Engine CompartmentEngine Identification (ID) Codes Engine ID codes are issued at beginning of KOER SELF-TEST. Codes are one-digit numbers represented by number of pulses displayed. See Fig. 2 . Engine ID code is equal to one-half the number o f engine cylinders. For example, 2 pulses would indicate that engine is a 4-cylinder. Engine ID code is used to verify proper PCM is installed and that SELF-TEST has been entered. Separator Code Single 1/2-second separator pulse is issued 6-9 seconds after last KOEO code. Continuous Memory Codes (intermittent faults) are then displayed 6-9 seconds after 1/2-second separator code. See Fig. 2 . Some digital test equipment may display separator code as "10" instead of "1". Pass Codes A Code 111 indicates no diagnostic trouble codes were recorded in that portion of test; system passes that portion of test. If Code 111 is not retrieved in KOEO SELF-TEST, codes retrieved during KOER SELF-TEST may not be valid. Code 111 (pass code) must be obtained in KOEO SELF-TEST. A Code 111-1-111 output during KOEO SELF-TEST indicates no KOEO code or Continuous Memory Code was recorded. Continuous Memory Codes Continuous Memory Codes are displayed after separator pulse code in KOEO SELF-TEST. These codes result from information stored by PCM during continuous self-test monitoring. These codes indicate faults recorded within last 40 engine starts (80 engine starts on some models). Fault may or may not be currently present. See DIAGNOSTIC TROUBLE CODE DEFINITION CHARTS . Use these codes for diagnosis only when KOEO SELF-TEST and KOER SELF-TEST result in Code 111. Fast Codes At start of KOEO SELF-TEST and after Wide Open Throttle (WOT) request in KOER SELF-TEST, PCM outputs short bursts of information, known as FAST CODES, which were used by manufacturer during assembly. These codes contain the identical information as slow codes, but are transmitted at 100 times the normal rate. With most equipment (except Super Star II tester), these code bursts are not visible. An entire code sequence lasts less than 1/2 second. Fig. 1: Reading Diagnostic Trouble Codes Using MIL/CHECK ENGINE Light (Using Analog Voltmeter Is Similar) Courtesy of FORD MOTOR CO. Fig. 2: Reading Diagnostic Trouble Codes (7.5L) Courtesy of FORD MOTOR CO. CLEARING CODESTo clear codes from PCM memory, start KOEO SELF-TEST. When diagnostic trouble codes appear on test equipment or Malfunction Indicator Light (MIL), disconnect jumper wire from Self-Test Input (STI) connector. If using STAR Series Tester, unlatch center button. This procedure erases Continuous Memory Codes from PCM memory. If problem has not been corrected or fault is still present, hard code will immediately be reset in PCM memory.
CAUTION: DO NOT disconnect vehicle battery to clear codes. This will erase stored operating information from Keep-Alive Memory (KAM). CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION section before disconnecting battery.


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Sunday, August 2nd, 2009 AT 12:39 PM
Tiny
ARNOLD SMITH
  • MEMBER
[quote="jac730"]Engine Performance problem
1995 Other Ford Models V8 Two Wheel Drive Automatic 46000 miles

I also have a motorhome with a ford drivetrain 460 motor. I have a 1993 Holiday Rambler with 61000 miles. I recently drove it after it sat for 1 years. I also had a backfire and lost power, it would idle ok but when I tried to take off it would not go. I turned it off and when I restart it the problem is completely gone for about 30 min and returnes. I have noticed when I have a full tank of gas I do not experience this problem. I drove 584 miles and kept filling the tank when it was at 3/4 and had no problem. I want to find the cause so if you get more info please relay it to me. Thanks
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Thursday, August 6th, 2009 AT 5:59 PM

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