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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Fuel problem maybe?

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Old 04-14-2011, 12:36 PM
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Originally Posted by SS RRR
Take the vacuum line off the fuel pressure regulator. If you don't know where that is, this page is a great reference:
www.shbox.com

Start the engine and see where the pressure is. It should never fluctuate with the vacuum line off. It should always read constant. Taking the vacuum line off will eliminate any idle speed variables.

If it were O2's it would would most likely run fine until going into closed loop.
It does run fine for about 20 seconds then dies and takes a few minuets to start again.
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Old 04-14-2011, 01:28 PM
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Originally Posted by lethal bird
It does run fine for about 20 seconds then dies and takes a few minuets to start again.
Unplug your O2's and start again. If it runs fine from then on out most likely the O2's are bad.
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Old 04-14-2011, 01:43 PM
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Ok ill check it. I cleaned the maf and did nothing.
Last edited by lethal bird; 04-14-2011 at 10:59 PM.
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Old 04-14-2011, 02:31 PM
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Un plugged them and still dying.
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Old 04-14-2011, 03:04 PM
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Also i flipped the key on engine off it primped stoped the started priming again and didnt quit and the tach started jumping until i turned the key off.
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Old 04-14-2011, 03:43 PM
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Originally Posted by leadfoot4
Just on an "off the wall" shot...You mentioned putting the DD back on the road. Is your 'Bird stored during the winter or driven infrequently? have you just put gas in it, or has it been sitting for a long time with the same gas in it? Maybe you have gotten some water in the gas. Hit it with some "dry gas" or Techron, and a few gallons of fresh fuel.

Sometimes it's the simple stuff.....
Most of this country has alcohol in the gas. Water should not be a problem, unless it's a lot of water.

Al
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Old 04-14-2011, 07:11 PM
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Originally Posted by lethal bird
Also i flipped the key on engine off it primped stoped the started priming again and didnt quit and the tach started jumping until i turned the key off.
Any reason it may be doing this?
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Old 04-14-2011, 10:58 PM
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Originally Posted by Big Al
Most of this country has alcohol in the gas. Water should not be a problem, unless it's a lot of water.

Al
Even if its not gas im still going to drain it and check it tomorrow just to rule one thing out because i did have a drop of water in the gas when i checked the fp when i revealed pressure in a cup and it was a little dirty and it starts getting harder and harder to crank and stay running where as when it was full was easy and drove for 5 to 10 min.
So far we have checked by unplugging o2s, maf, new battery, checked fuel pressure, cleaned the maf, changed the fuel filter. Im going to drain the gas and check the coil and icm tomorrow by swapping out to my friends anything else i could check with minimal tools tomorrow while im at it?
Last edited by lethal bird; 04-15-2011 at 12:19 AM.
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Old 04-17-2011, 12:39 PM
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Formula.fx did you figure anything out yet?
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Old 04-17-2011, 05:31 PM
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No water in the gas. So thats not a problem. Still waiting on the new coil and icm. Tried cranking it after checked the gas and it back fired and died and wont crank back. No it wont crank at all.
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Old 04-17-2011, 09:22 PM
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Also hooked my laptop up and it connected so could it will be the pcm? Anybody got any suggestions because i really dont want to put it in the shop.
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Old 04-18-2011, 12:27 AM
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Had to replace the fuel filter in mine. It was clogged and the car ran a bit better after, but still had same issues. Looking at the injectors tomorrow.
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Old 04-18-2011, 03:15 PM
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Ok someone told me to clean my IAC and see if it will work. Will the IAC cause the problems im having?
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Old 04-19-2011, 11:15 PM
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Bump.

I'm stumped.
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Old 04-20-2011, 09:39 AM
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Originally Posted by lethal bird
No water in the gas. So thats not a problem. Still waiting on the new coil and icm. Tried cranking it after checked the gas and it back fired and died and wont crank back. No it wont crank at all.
When you say it wont crank do you mean it wont turn over ?
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Old 04-20-2011, 09:47 AM
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Originally Posted by djjab57
When you say it wont crank do you mean it wont turn over ?
It will turn over just wont start.
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Old 04-20-2011, 10:01 AM
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Turn the key to the on position and watch the tach needle. If it does move, put a crank sensor on it. Had that happen to me last year.
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Old 04-20-2011, 10:44 AM
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Originally Posted by Clyde H Frasier Jr
Turn the key to the on position and watch the tach needle. If it does move, put a crank sensor on it. Had that happen to me last year.
It did the same thing mine is doing? and how hard are they to change out?
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Old 04-20-2011, 10:56 AM
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Do 95 lt1s even have a crank sensor because i couldnt find one.
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Old 04-20-2011, 05:36 PM
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Update:
Looks like I need a new fuel pressure sensor. I Don't have the cash right now but when I get it installed I'll update on if that was the main problem or not. lethal bird, have you looked into checking that?
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