1999 Chevy Venture Engine stops after 5min

Tiny
MSHOWARTH
  • MEMBER
  • 1999 CHEVROLET VENTURE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
Hi
My 1999 Venture van has been off the road for 11/2 years. Now I am trying to get it back on the road, it was running fine before being layed-up
It starts OK and runs for approx 5 minutes then starts to splutterand stop/or just quits and will not start again until it has cooled approx 5min
Regards
Mike
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Sunday, November 15th, 2009 AT 7:02 PM

17 Replies

Tiny
MATHIASO
  • MEMBER
Is there engine light?
When last time you did tune up?
Have you ever changed the fuel filter< since it got 22000 miles/?
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Monday, November 16th, 2009 AT 4:27 AM
Tiny
MSHOWARTH
  • MEMBER
Thanks for your response
Check engine light is only on sometimes.
Used diagnostic tool shows codes PO117 coolant input low and P0118 coolant input high.
Fuel filter/air filter and front spark plugs changed, vehicle still runs the same stopping after it warms up and is then hard to start and runs rough.
Oil changed and was not milky, no water dripping from exhaust. Exhaust only a little white.
Trying to change the rear plugs, rotated engine forward but finding it very difficult to get to rear bolts of coil pack mounting bracket, passenger side one has plastic plug on top of it.
Regards
Mike
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Thursday, November 19th, 2009 AT 1:45 PM
Tiny
MATHIASO
  • MEMBER
The performance problem is related to the codes.
The coolant sensor may be faulty.
Short to ground circuit between ECT terminal A and PCM connector terminal 4p
ECT signal and ground circuit circuit short each other.
Here is what you need to do.
- Inspect if ECT sensor terminal is bent.
Turn the key to off
Disconnect ECT sensor connector
Check for bent ECT sensor terminals A and B
- Determine is ECT sensor malfunction or hasness malfunction.
Mesure resistance between ECT sensor terminal A and B
the resistance should be within 2.27-2.74 kilohms(20*c 68*F
- inspect ECT siagnal circuit for short to ground.

Turn ignitiion key off
Disconnect pcm connector
check continuity between ECT sensor terminal A and body GND
check continuity between A and B harness side.

Report what you have find.
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Friday, November 20th, 2009 AT 1:39 AM
Tiny
MSHOWARTH
  • MEMBER
ECT sensor terminals not bent
Resistance between terminals A and B 50 kilohms at 5*C
Continuity between sensor terminal A and body 800hms
Continuity between A and B harness side 1400hms
(did not disconnect pcm connector)?
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Monday, November 23rd, 2009 AT 6:20 PM
Tiny
MATHIASO
  • MEMBER
Replace the coolant sensor.
Clear the code
start the engine.
Is the DTC present?
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Tuesday, November 24th, 2009 AT 1:48 AM
Tiny
MSHOWARTH
  • MEMBER
Coolant sensor replaced P0177/0118 codes cleared.
Engine now misfiring dtc code
P1374 crankshaft position sensor 3X reference circuit.
I have Haynes repair manual and it only refers to 7X and 24X. Why does the code only refer to 3X?
Tasks completed
Change fuel filter, coolant sensor, PCV valve, spark plugs and wires, air filter.
Thanks for your continued support.
Mike
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Thursday, November 26th, 2009 AT 4:31 PM
Tiny
MATHIASO
  • MEMBER
The 3X reference signal is produced by the ignition control module. The ICM calculates the 3X reference signal by dividing the crankshaft position (CKP) sensor 18X pulses by 3 when the engine is running and when CKP sync pulses are also being received. The PCM uses the 3X reference signal in order to calculate engine RPM and the crankshaft position at engine speeds above 1200RPM. The PCM also uses the pulses on this circuit in order to initiate the injector pulses. The PCM constantly monitors the number of pulses on the 3X reference circuit, and compares the number of 3X reference pulses to the number of 18X reference pulses and CAM signal pulses being received. If the PCM receives an incorrect number of pulses on the 3X reference circuit, the PCM will use the 18X reference signal circuit for fuel and ignition control. The engine will continue to start and run using the 18X reference and camshaft position PCM input signals only. DTC P1374 will set.

Conditions for Setting the DTC
The ratio of 18X reference pulses to CAM signal pulses received by the PCM equals 36:1.

The ratio of 18X reference pulses to 3X reference pulses received by the PCM does not equal 6:1.

Test for the following conditions:

A malfunctioning ignition coil--Remove the ignition coils and inspect the ignition control module and the coils for cracks, carbon tracking, or for other signs that indicate that the coil secondary circuit is arcing to the ICM or to the ICM wiring harness. Refer to Ignition Coil(s) Replacement and ask you needed.

The secondary ignition wires arcing to wiring harness--Inspect the secondary ignition wires for carbon tracking or for other signs of damage.
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Thursday, November 26th, 2009 AT 8:19 PM
Tiny
MSHOWARTH
  • MEMBER
Removed coil pack and coils from ICM,
No cracks or visual signs of arcing or carbon on coils or ICM only signs of oxidization (white powder)
Not sure what you mean secondary wires, if you mean the electrical plugs that connect to the module they are fine no signs of arcing.
While checking wires noticed the plastic air tube that connects from the air intake duct (next to the intake air temperature sensor) to the back of the engine block was pulled out of the block and is a very loose fit when pushed back in, please comment
Thanks
Mike
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Saturday, November 28th, 2009 AT 4:50 PM
Tiny
MSHOWARTH
  • MEMBER
Add info to last reply
Resistance across each set of terminals of the coils is between 5000-6000 hms and btween each set of terminals on ICM 4500, 8000 and 5000 hms
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Saturday, November 28th, 2009 AT 5:42 PM
Tiny
MATHIASO
  • MEMBER
2 likely causes are
the ignition control module, or the computer(pcm). But there could also be a wiring problem
between the two. Sometimes the wiring harnesses of the ignition control module
rub on the module, coils, or plug wires and give false signals
The plastic air tube that connects from the air intake duct (next to the intake air temperature sensor) to the back of the engine block is part of cranckcase ventilation.
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Saturday, November 28th, 2009 AT 5:55 PM
Tiny
MSHOWARTH
  • MEMBER
What do suggest I do?
Reassemble and make sure the wires are not touching or what.
Is it Ok for the tube not to be a tight fit in the crankcase?
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Saturday, November 28th, 2009 AT 6:07 PM
Tiny
MATHIASO
  • MEMBER


http://www.2carpros.com/forum/automotive_pictures/46384_coil_checks_1.jpg



First, isolate the coil pack by disconnecting all the leads. Set the ohmmeter in the low range, and recalibrate if necessary. Connect the ohmmeter leads across the ignition coil primary terminals, and compare the primary resistance reading to specifications (typically less than 2 ohms). Then connect the ohmmeter leads across the coil secondary terminals and compare the secondary resistance reading to specifications (typically 6,000-30,000 ohms). If readings are outside the specified range, the coil is defective and needs to be replaced.
If measuring the secondary resistance of a DIS coil is difficult because of the coils location, try removing the wires from the spark plugs and measure secondary resistance through the plug wires rather than at the secondary terminals on the coils. Just remember to add in a maximum of 8,000 ohms of resistance per foot for the plug wires

lube the end of the tube that goes in the cranckcase with engine oil. insert it in the hgole. must easier.
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Saturday, November 28th, 2009 AT 6:27 PM
Tiny
MSHOWARTH
  • MEMBER
Resistance across each set of secondary terminals of the coils is between 5000-6000 ohms
Ignition coils primary terminal resistance.4-.5 ohms.
No cracks or visual signs of arcing or carbon on coils or ICM only signs of oxidization (white powder)
Regards
Mike
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Sunday, November 29th, 2009 AT 6:09 PM
Tiny
MATHIASO
  • MEMBER
5000-6000 ohms it is out of specification. Should be 6,000-30,000 ohms
oxidation should not be there, it seem like the icm overheat.
The coil may be faulty.
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Sunday, November 29th, 2009 AT 10:05 PM
Tiny
MSHOWARTH
  • MEMBER
The Haynes manual for this vehicle says it should be between 5000-7000 ohms.
I have cleaned all the contacts and have put the ICM back in the van.
It will now start fine, no backfire, accelerate fine and is running smoothly but stops after about 15 minutes it will not maintain an idle rpm and is hard to restart.
Does this still sound like the ICM?
Thanks
Mike
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Friday, December 4th, 2009 AT 11:23 AM
Tiny
MATHIASO
  • MEMBER
The vehicle has not been on the road for 11/2 years.
It starts fine when cold, stops running when hot.
This is the problem we're having. This happen when a poor or corrosion in wiring connection stops working.
If the ICM is oxidized, or white power on it, it should not be there, I do not know how badly is the oxidation, or check poorly connection that may overheat
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Friday, December 4th, 2009 AT 1:15 PM
Tiny
MSHOWARTH
  • MEMBER
Changed ICM and coils, vehicle now seems to operate fine have had it running for over 30 min but not taken it on a run yet.
Thanks for your help.
Mike
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Tuesday, December 8th, 2009 AT 8:20 PM

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