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| 85 2M4 Misfire, help would be appreciated (Page 2/3) |
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Patrick
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OCT 18, 03:28 PM
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| quote | Originally posted by Forrest:
Could it be a faulty fuel pressure regulator?
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Completely eliminating/plugging the fuel return wouldn't result in a duke fuel pump creating 90 psi of pressure. Something's wacky, but I suspect it isn't the regulator.
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Klyde7_2M4
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OCT 18, 03:42 PM
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So I've replaced the fuel pump, did that yesterday, car is running a little better, not as rich, but still shudders could it be the ecm? I've tested for codes and it doesn't give out 55 whose to say that's supposed to work though lol
What ecm options do I have? Is there any aftermarket ones or better coded ecms than the OEM? Or will I have to get a remanufactured one?
Also thinking about rebuilding the throttle body, a hose died in the tank and had tube gunk in the old sock, could that have messed with the tbi?
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Gall757
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OCT 18, 03:48 PM
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The ECM is probably fine. It's not smart enough to make a Fiero shudder.
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Klyde7_2M4
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OCT 18, 03:53 PM
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More I can add
The car is missing on not any specific cylinder, it's erratic and across the entire engine checked the spark plugs and none of them were fouled or wet
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Patrick
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OCT 18, 04:11 PM
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| quote | Originally posted by Klyde7_2M4:
I've tested for codes and it doesn't give out 55
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Perhaps more importantly, does it give a Code 12?
| quote | Originally posted by Klyde7_2M4:
What I've done... Timing
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Gotta ask... With the ALDL jumper in place?[This message has been edited by Patrick (edited 10-18-2021).]
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Klyde7_2M4
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OCT 18, 04:19 PM
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Yes it gives code 12, does the jumper have to be in place to correct timing, I thought 85's are done manually
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Gall757
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OCT 18, 06:53 PM
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| quote | Originally posted by Klyde7_2M4:
Yes it gives code 12, does the jumper have to be in place to correct timing, I thought 85's are done manually
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Timing is done manually with the jumper in place.
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Klyde7_2M4
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OCT 18, 07:59 PM
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Would be resetting the ecm after not do anything if I didn't use the jumper?
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Gall757
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OCT 18, 08:15 PM
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If the timing is set without the jumper, there is nothing the computer can do to overcome the error.
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buddycraigg
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OCT 18, 08:16 PM
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you have to set the base timing by adjusting the distributor when the aldl jumped.
the ECM controls the timing advancement after that.
REsetting the ECM won't do anything if the base timing wasn't set correctly in the first place.
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