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big big problems

 
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02ImpalaDude
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PostPosted: Mon Jul 02, 2012 12:01 am    Post subject:  big big problems Reply with quote

so i replaced my LIM gaskets last week and the car has been running strong for 3 days after i put the engine together. no check engine light or anything. so weird sounds or vibrations from the engine, completely normal. after coming back from the movies (saw ted, funniest movie possibly ever) and dropping off my friends, went back to the car. tried to start it and it would only turn over if i gave it gas about half throttle. and when i gave it gas it would sputter. when i left off the gas it would stall. couldn't get it to run at all without giving it gas. my friend said he saw sparks coming from the engine bay too Surprised could it be something with the fuel rails? i thought i had tightened them down ok and secured them. the car is still at his place I'm going tomorrow to look at it. help!
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Frank
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PostPosted: Mon Jul 02, 2012 3:01 am    Post subject:   Reply with quote

It could very well be the IAC or an unplugged vacuum line or plug somewhere...no idea on the sparks though.

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02ImpalaDude
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PostPosted: Mon Jul 02, 2012 3:13 am    Post subject:   Reply with quote

could it be the brake booster vacuum line? i lost the clip that keeps it in the upper intake manifold.
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jmakinen
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PostPosted: Mon Jul 02, 2012 3:26 am    Post subject:   Reply with quote

Check your plug wires. Old/disconnected plug wires are known to cause sparks under your hood. My guess is maybe one of them popped off.

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Lingenfelter
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PostPosted: Mon Jul 02, 2012 10:52 am    Post subject:   Reply with quote

Since this was at night, I guess it would be possible you were seeing 'sparks' in the alternator?

If you need to be boosting the fuel levels to make it run, I would expect there could be a fuel line or vacuum issues. I'd be surprised a fuel line was leaking or loose without your knowledge... the lines are under pressure and there would probably be substantial fuel leakage if that were the case. Did you wrap the ends of the fuel lines and injectors to ensure they remained clean during the gasket installs?

Assuming that you did properly wrap the fuel lines and injectors, I would go to checking for vacuum leaks. If it doesn't know about all the air it's getting, it'll be running lean, or not at all. I guess giving it more gas may temporarily improve the air/fuel mix. It's possible that your gaskets didn't tighten down properly or that the UIM has a hairline crack in it. Check your other vac lines, especially near fittings and bends, where moving them around could cause cracks.

Have you had any lights or codes?

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02ImpalaDude
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PostPosted: Mon Jul 02, 2012 12:41 pm    Post subject:   Reply with quote

no lights or codes or anything. i put some RTV around all the gaskets and let it sit for 24 hours to make sure it settled, i checked for fuel leaking around the injectors, nothing. is it at all possible an unplugged brake booster vacuum line that goes into the UIM could cause this
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IffyG
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PostPosted: Mon Jul 02, 2012 12:43 pm    Post subject:   Reply with quote

Any large vacuum leak can cause the car to be difficult to start.

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02ImpalaDude
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PostPosted: Mon Jul 02, 2012 2:06 pm    Post subject:   Reply with quote

all bolts were properly tightened, nothing was missing, the upper intake manifold is brand new from ac delco, there were no fuel leaks i could see, i checked all around the injectors, I'm hoping its a vac line issue.
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98ss
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PostPosted: Mon Jul 02, 2012 10:13 pm    Post subject:   Reply with quote

I had the same issue, I got a defective upper intake manifold gasket. Filled #4 cylinder up. Lucky for me the car sat over night. Not saying this is your case, but it might be worth pulling the plugs out to see if any coolant comes out or if any of the plugs are wet. By all means check the simple stuff first. Maybe some of the plug wires worked themselves loose.
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02ImpalaDude
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PostPosted: Mon Jul 02, 2012 11:50 pm    Post subject:   Reply with quote

i double checked all the vacuum lines, turns out the brake booster vac line had a huge crack on the bottom. that solved it! phew
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