C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

car not running right

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Old Apr 2, 2009 | 11:03 PM
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Default car not running right

I have a 1985 vette the car will idle fine and you can fev it up just fine when in park but when you drive it feel like it is missing , I have put new injecters in and new fule pump I have 40 lbs of fule at idel and 35 when rveing up the motor.There is also all new plugs and wires as well as all new parts in the distributer as well. I am at a loss can anyone HELP?????
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Old Apr 2, 2009 | 11:34 PM
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From: Near Lockport NY Black 1986 Coupe
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Your problem is either in the timing or fuel filter, both will cause misfire and lack of power. I would suggest changing the filter first as it's the easiest - unless you're skilled with a timing gun, of course.
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Old Apr 2, 2009 | 11:48 PM
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From: North Bay Ontario
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Is the "check engine" light on? If not, is it working properly (e.g. bulb not blown) because from what you describe I'd be very surprised if the ECM hasn't thrown some codes. I'd be starting there...
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Old Apr 2, 2009 | 11:53 PM
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Originally Posted by Master__Shake_
Your problem is either in the timing or fuel filter, both will cause misfire and lack of power. I would suggest changing the filter first as it's the easiest - unless you're skilled with a timing gun, of course.
Thank you, I have a new filter and timming is 6 degree's BTDC.
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Old Apr 2, 2009 | 11:55 PM
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Originally Posted by pletzvet
Is the "check engine" light on? If not, is it working properly (e.g. bulb not blown) because from what you describe I'd be very surprised if the ECM hasn't thrown some codes. I'd be starting there...
Thank you,Check engine light is not on but I will use my code reader to see if there are any codes. Is it possible that the ecm is bad?
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Old Apr 4, 2009 | 08:34 AM
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From: holland mass
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sounds like your fireing order is wrong
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Old Apr 4, 2009 | 10:01 PM
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Originally Posted by shane1975
sounds like your fireing order is wrong

Double checked firing order it's good. Now with the timing mark on 0 deg's should the rotor be pointing right at the #1 post on the dist cap or just a little after it
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Old Apr 5, 2009 | 07:21 AM
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Default Double and triple check your plugs and wires

I suffered a horrible miss for 2 weeks until a senior tech found the problem. An AC delco spark plug was slightly broken. How was it "slightly" broken? The white ceramic part was a bit loose and I could turn it about an 1/8th of an inch in either direction while holding the steel part.

To me, that wasn't broken. I had seen broken spark plugs before and they were in multiple pieces. Even though this stupid plug didn't look broken, it was. That was all that it took to drive me crazy for a couple of weeks.

Double and triple check your wires and plugs and examine them very closely. Good luck!
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