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White92Cutlass

Car Hesitating/Dying

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Need some help from the Gurus here. 1992 Cutlass Supreme 3.1, automatic stumbles on acceleration for a second and dies at times when accelerating from a stop (within a few feet). Shop threw parts at it, issue not fixed. Shop put new fuel pump, new fuel filter, 2 new coils, new coil pigtail, 3 new spark plugs, new throttle position sensor, new PCV and hose, and new crankshaft position sensor. Second shop said that bad fuel injectors was the problem and they guaranteed that that would fix it (for $1,600). I took it from the shop and replaced all 6 fuel injectors myself along with the upper intake gaskets for $80. However, issue is still there. Only code it is pulling is 45- left bank oxygen sensor. I unpugged the upstream oxygen sensor harness- it still dies. Also has irratic idle at times (up or down 500 rpms). Any help would be greatly appreciated- thanks!

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What is the fuel pressure just before the engine stalls?

What is the cranking compression pressure of all six?

Connect a scan tool, look at the data stream.  Short- and long-term fuel trims, engine coolant temperature, O2 sensor readings and cross-counts,  EGR operation, MAP sensor values, and all the other sensors/actuators.

 

 

Have you followed the diagnostic procedure for the Code 45, or are we just ignoring it?

Edited by Schurkey

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This is very odd........an OBDI vehicle does not make use of a *left bank* oxygen sensor..... there is only one in the system & that is just before the cat.

 

You're also misreading the code 45....that does not suggest that the o2 sensor is at fault....that code is telling one that there is a rich situation where the fuel mixture is concerned.

Removing the harness from the o2 will not correct that issue.

Did either of those *shops* test the FPR for proper function?

Edited by 55trucker

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This is very odd........an OBDI vehicle does not make use of a *left bank* oxygen sensor..... there is only one in the system & that is just before the cat.
 
You're also misreading the code 45....that does not suggest that the o2 sensor is at fault....that code is telling one that there is a rich situation where the fuel mixture is concerned.
Removing the harness from the o2 will not correct that issue.
Did either of those *shops* test the FPR for proper function?



You know what, for some reason I was thinking he said the fuel pressure regulator was replaced but we reading it doesn’t seem like that was the case. This almost sounds exactly like what my monte Carlo was doing when the fuel pressure regulator went bad.

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Tested the fuel pressure regulator. No sign of fuel when removing the vacuum hose. 39 with key on and not started, 36 with engine idling. 44 when vacuum hose is pulled off when it is running. Are these numbers within required specifications? Thanks!

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Those all sound good, no rich condition there, with the engine running one pulls off the vacuum line to the FPR & the pressure should rise, the vacuum to the diaphragm keeps the pressure regulated to what is needed in a high vacuum scenario (idle/no throttle).

Soooo........the next time this situation occurs (if at home) immediately pull all the plugs, look for signs of flooding in any of them, if all look dry & somewhat normal (tan colour, fluffy brown deposits) that would suggest they are all firing normally & the engine is not running rich.

 

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1 hour ago, 55trucker said:

 pull all the plugs, look for signs of flooding in any of them, if all look dry & somewhat normal (tan colour, fluffy brown deposits) that would suggest they are all firing normally & the engine is not running rich.

 

"Normal" hasn't looked like that around here for decades.  Around here, unleaded gasoline burns so clean it takes thousands and thousands of miles to put color on the plugs.  I'd expect them to look virgin-white (at least the three new ones.)

What kind of shop puts three spark plugs into a six-cylinder car?  Were they the rear-bank plugs and someone already replaced the fronts?

 

PUT A SCAN TOOL ON THIS CAR.  Look at the data stream.  And does Code 45 come back when it's cleared?  Did you ever bother to follow the diagnostic procedure for Code 45?

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