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

SR on but running like crap.

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Old Mar 11, 2004 | 06:34 PM
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Default SR on but running like crap.

I now have the SR base, plenum and runners installed. The only problem is that the car runs like crap the idle varies from 700-1300 and upon acceleration it might get a little backfire every once in a while and the timing is correct along with the plug wires.

What else could it be I was thinking a vaccume leak or egr. How should it run without any computer tuning. :confused:

Thanks for the help
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Old Mar 11, 2004 | 06:58 PM
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Default Re: SR on but running like crap. (vetteguy216)

Even with the stock chip it should run almost normal, just a LOT faster in the upper rpms.. (Mine at least did).

Could be that when you put the intake back on, you did what a LOT of use Superram guys did the first time.l Put the distributor on a few teeth off, or 160degrees reversed. Sounds like a timingissue if you can not find a huge vacuum leak. (Which you can HEAR on the superram even at idle).

Good luck..
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Old Mar 11, 2004 | 07:00 PM
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Default Re: SR on but running like crap. (MrNuke)

You could have a vacuum leak. I would check it with propane. This is a quick easy way to find a leak
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Old Mar 11, 2004 | 07:00 PM
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Default Re: SR on but running like crap. (MrNuke)

The distributor never came out the Base was alread on I just Installed the runners and plenum
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Old Mar 12, 2004 | 02:41 PM
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Default Re: SR on but running like crap. (vetteguy216)

What year is you car?
If you have have SD system than probably you'll need custom made chip.
As for idle, try to reset IAC motor.
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Old Mar 12, 2004 | 02:47 PM
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Default Re: SR on but running like crap. (Sliding)

Check for vacuum leaks or a random hose you forgot to reattach. The stock program even in a SD car should be more than adequate to run properly at least.
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Old Mar 12, 2004 | 02:48 PM
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Default Re: SR on but running like crap. (Sliding)

I had a real problem with mine idling too when i first put it on, turns out the runner-intake manifold had a good sized leak, not sure about the backfiring? That almost sounds like the timing is off. I just used starting fluid from a can and found the leak instantly. Check that first. Put a vacuume gage on it.
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Old Mar 12, 2004 | 04:47 PM
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Default Re: SR on but running like crap. (vetteguy216)

Thanks for the replies guys its not a SD though.

I am going to try to find the vaccume leak if I cant I am going to put the stock back on until I get some more goodies to go along with it.
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Old Mar 12, 2004 | 04:55 PM
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Default Re: SR on but running like crap. (vetteguy216)

Did you Double and Quadruple check on the firing order of the cylinders?

I know it sounds trivial, but you never know.. :smash:
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Old Mar 12, 2004 | 05:51 PM
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Default Re: SR on but running like crap. (Black87c4)

I used the starting fluid trick for a long time. It ignited once. Lost both eyebrows. The good news is they grew in nicer than they were . :rofl: :lolg: :lolg:
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