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Olds 98 1985y 3.8 black smoke no idle

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Old 11-13-2021, 10:46 AM
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Originally Posted by gpow
What we found is that injectors injects fuel too late when piston is already moving down. Who is responsible for it? I
Exactly how did you determine this?
Old 11-13-2021, 11:40 AM
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Originally Posted by carfixer007
Exactly how did you determine this?
i have turned ignition on and spinned engine manually ans saw where piston is by removing spark plug and we can hear when injector clicks
Old 11-25-2021, 04:09 PM
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Hello guys!
i have checked with OBD1 when car was not started no fault codes.
i will try to start and see live data maybe you can suggest me what I can check in live data?
or anyone else has any suggestions what else to check.
as well attaching one interesting screenshot what was on scanner.
there are no MAP in this car it uses MAF



Old 11-25-2021, 08:32 PM
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Do you know how to use that tool? That was the first scan tool I used. The TPS and MAP are both out of range. Make sure they are connected correctly and inspect the wiring.
Old 11-28-2021, 08:49 AM
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Hello.

Update. I have inspected all wiring drom knock sensor, tps, iac, maf to ecu. And all communications and wiring is correct.
One thing what i have noticed is this esc module. We do get all signals from knock sensor, maf.
But if I unplug ESC module and start car it does not changes at all. Everything is same.
Attaching photo
Old 11-28-2021, 08:50 AM
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Originally Posted by gpow
Hello.

Update. I have inspected all wiring drom knock sensor, tps, iac, maf to ecu. And all communications and wiring is correct.
One thing what i have noticed is this esc module. We do get all signals from knock sensor, maf.
But if I unplug ESC module and start car it does not changes at all. Everything is same.
Attaching photo


Old 12-02-2021, 03:47 AM
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Could it be as well bad maf sensor and how to check it without live data. As car running when i unplug it nithing changes as well
Old 12-02-2021, 02:53 PM
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Does the engine stumble when tapping the sensor?
Old 12-02-2021, 03:07 PM
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No changes at all. Could it be that it is MAF related issue? As unpluging MAF does not affect engine as well
Old 12-02-2021, 05:41 PM
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If the engine ran better with it disconnected then the sensor needs replacing.


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