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

Is it running ok?

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Old Feb 18, 2008 | 05:43 PM
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Default Is it running ok?

Hi guys,

I bought a 90 vert that was in a accident just over a year ago and Its going to be ready for the road this spring. It has never seen the road besides moving it around. So my problem is that I took it in for an alignment and finally stepped on it. It seems sluggish and has a rough idle, but start instantly. How do I know if all the injectors are working? or is there another issue. And by the way the wires, plugs....etc.. were all done.

After pic, and the car is really dirty.
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Old Feb 18, 2008 | 05:49 PM
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You're asking a lot of questions with little info backing. If you don't know the history of the car besides a tune up, a thorough cleaning of the throttle body and IAC passage ways wouldn't be so bad as well as a change out of the fuel filter. Also, depending on the definition of rough idle, you may have a vacuum line or two needing replacement.

I'd do that before just thinking fuel injectors are bad.

Also, get an FSM and go through some of the troubleshooting in there. You might just find your answer with a little reading of it.

Last edited by evmlarry; Feb 18, 2008 at 05:51 PM.
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Old Feb 18, 2008 | 05:57 PM
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hey guys, little bit of a rookie here. not very good with the abbreviations. also where is the fuel filter located?
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Old Feb 18, 2008 | 06:42 PM
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IAC...idle air control..
FSM.....factory service manual
Fuel filter passenger side tucked in near the rear of front wheel by rocker panel. The fuel filter will not be easy to remove...I have a 90 Vert also and had to drop the cross frame(only verts have them for body rigidity). I see you have a 91+ rear bumper..
The injectors..if original are" Multecs"(1989-19991 crap). Check the resistance on each one with an ohm meter..16.5 +/- .5 is the spec. If they are looking like 15 ohms and less are all over the place..they are on their way out..DO NOT REPLACE with Multecs. I changed mine last summer with only 17,000kms(10,500 miles) on the Vette...went with Accel silver tops.

Last edited by UNCLEBILL; Feb 18, 2008 at 06:51 PM.
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Old Feb 18, 2008 | 09:15 PM
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when I check the resistance, am I removing the connector and testing the two? leads at the injector?
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Old Feb 19, 2008 | 06:23 AM
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Originally Posted by gvrabac
when I check the resistance, am I removing the connector and testing the two? leads at the injector?
Thats the way!!!!!!
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Old Feb 19, 2008 | 07:08 AM
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Originally Posted by gvrabac
Hi guys,

I bought a 90 vert that was in a accident just over a year ago and Its going to be ready for the road this spring. It has never seen the road besides moving it around. So my problem is that I took it in for an alignment and finally stepped on it. It seems sluggish and has a rough idle, but start instantly. How do I know if all the injectors are working? or is there another issue. And by the way the wires, plugs....etc.. were all done.

After pic, and the car is really dirty.

I wish that my car was that "dirty"

Good advice above, you should be fine
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