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gbrough
Novice
Jun 2, 2009, 4:06 PM
Post #1 of 11
(4806 views)
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i have a 96 saturn that is driving me crazy! It is a sc1 with a 1.9 and a 5 speed. Runs great in the garage. Go to drive it and within 5 min it bogs down and starts to die. Just makes it into the garage. It is setting a code for the egr valve. (p0405) I have replaced it and cleaned the throttle body and egr passages going to the motor and intake manifold. Compression check was ok. Fuel pressure check was ok. Coil pack was ok. Replaced the wires and plugs. Cleaned and checked the fuel injectors.
Please help
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Loren Champlain Sr
Veteran
/ Moderator
Jun 2, 2009, 4:10 PM
Post #2 of 11
(4799 views)
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Although improbable, it is possible that the PCM is commanding the EGR to open prematurely or at incorrect times. Circuit or PCM fault is a possibility. I'd want to check fuel pressure, but can't 'see' the relation to the EGR code. Any ideas, guys?
Loren
SW Washington
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gbrough
Novice
Jun 2, 2009, 4:17 PM
Post #3 of 11
(4798 views)
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Would the egr valve cause the car to die out? I already checked fuel pressure, it was ok.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 2, 2009, 4:39 PM
Post #4 of 11
(4793 views)
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Did you check the fuel pressure at the moment the car was failing?
What was the pressure?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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gbrough
Novice
Jun 2, 2009, 4:51 PM
Post #5 of 11
(4785 views)
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No I didn't check it when the problem was occuring. I checked it with the engine running in the garage.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 2, 2009, 4:54 PM
Post #6 of 11
(4781 views)
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That tells you nothing at all. Of course the pressure would be OK, the car was running fine at the time. It has to be checked during the failure or it doesn't tell you anything.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
Veteran
/ Moderator
Jun 2, 2009, 5:09 PM
Post #7 of 11
(4775 views)
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The EGR could cause the engine to die if it opens at idle speed, but the IAC should compensate. Really don't think that's your problem.
Loren
SW Washington
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Asilus
User
Jun 9, 2009, 8:20 PM
Post #8 of 11
(4746 views)
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EGR valve is for emissions controle, lets exhaust back in through the intake manifold to reburn excess fuels... there is cases of people making closed gaskets and closing the piping compleatly to keep that from happening ( eligal though). This may not be the case but it sounds like there maybe some blockage in your exhaust pipe, forcing an extensive ammount of exhaust back into your engine when it opens up, maybe run fuel system treatment in your car to break down any carbon that may have built up in or around the cat converter.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 10, 2009, 12:21 AM
Post #9 of 11
(4745 views)
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Respectfully, an EGR (exhaust gas recirculation) valve is NOT there to burn unburned fuel but rather at part throttle allow already burned vapors (exhaust) to re enter incoming air and fuel which by doing so lowers combustion temps which reduces NOx emissions. It's not there to burn off hydrocarbons unburned. If and when one sticks open at idle (when it should be inoperative) it could cause a stall. If plugged off engine may knock as it's counting on the slightly diluted mixture of air, fuel, with some already burned exhaust gases which controls knock.
The converter(s) are there to convert unburned hydrocarbons but only in minuscule amounts or converters take a hit.
When engine is running properly there isn't much unburned fuel left in exhaust - again recirculation of already burned exhaust reduces combustion temps.
EGRs should be closed at idle and full throttle if normal,
T
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autojoe
User
Jun 10, 2009, 7:29 AM
Post #10 of 11
(4738 views)
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if you clear code and it returns......then the computer has detected a problem in the egr or circuit.you replaced egr and cleaned egr passages and still code returns after you cleared code from computers memory?I take it you do not have a scan tool with ability to monitor the egr pintle position or voltage?check for B+ voltage at terminal (E) pink wire with ignition switch in on position.check egr 10 amp fuse.just my two cents.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 10, 2009, 8:39 AM
Post #11 of 11
(4732 views)
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Tom G is 100% correct. Without the EGR, you could get ignition ping and high NOx emissions. It could even lead to piston damage in severe cases.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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