removing sc and adding a turbo what needs to be done? - Page 6 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-17-2007, 06:17 PM   #51
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Quote:
Originally Posted by sandrock
You *need* to check your fuel pressure when the engine is under a load. Doing it in park will not get you the results you need, no matter how high your revs are.

You also need to get that KR under control. Do the FWI. Get that engine cooler somehow (yes do the 180* and fan bypass mod). Make sure your cat isn't clogged, and your fuel injectors are cleaned. And go over the engine with a fine-tooth comb for anything loose. Oh yeah...and make sure your O2 sensor wires are routed away from the spark plug wires.

One more thing (in ancient Chinese Man'* voice)...make sure the MAF sensor is clean.
all you have to do is disconnect the vacuum line from the fuel pressure regulator.

thats the same as wot.
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Old 09-17-2007, 06:42 PM   #52
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Quote:
Originally Posted by samueljackson
all you have to do is disconnect the vacuum line from the fuel pressure regulator.

thats the same as wot.
That may be true...but it still isn't under a load. That is the only way to get a true reading. My pressure readings varied between loaded and unloaded tests, unloaded being less.
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Old 09-18-2007, 07:52 AM   #53
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i have no cat. and this morning on my way home from work. with the IAT at 63* ECT at 180* and from a 10mph roll i punched it and saw 5-KR constant. and sometimes the car acts like its starving for fuel at WOT and about 8psi boost. " new fuel filter 6k miles ago"
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Old 09-18-2007, 07:55 AM   #54
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Gotta know that fuel pressure. Try to stay out of WOT until you do.

You also have to make ABSOLUTELY sure you got all the cracks in the EM'*. Some of them are VERY hard to see. Check for vac leaks as well, and leaks in and around the EGR stovepipe between the top of the valve and the supercharger.
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Old 09-18-2007, 12:02 PM   #55
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ok. i will check that today. and let u know what i find.
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Old 09-19-2007, 12:12 AM   #56
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Quote:
Originally Posted by 95riviera
ok. i will check that today. and let u know what i find.
idk if u have to weld ur exhaust manifold or not, but if you need an em let me know
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Old 09-19-2007, 07:27 AM   #57
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i have welded the. there was 4 cracks in front pipe and one in rear
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Old 09-19-2007, 07:59 AM   #58
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SJ, he stated eariler in this topic that this was done.

Riv, look at my old pics in my 'holy exhaust cracks batman' topic. You'll see just how difficult it is to find those cracks. But for the time being, try to find any exhaust/EGR leaks and check that fuel pressure first, rather than pull your EM'* again for now.

Check your fuel pressure:


1. Key on for 2 seconds (no start), repeat 2 more times (prime for 2 seconds, 3 times). What'* the pressure?

2. Start and idle. What'* the pressure?

3. At idle, pull the vac line off the FPR. What'* the pressure (no, this is not as accurate as WOT under load, but it can give an indication of a problem under those conditions).
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Old 09-19-2007, 10:50 AM   #59
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My under load FP was about 7 psi over my no-load. I would think it would be safe to assume that yours should be close to the same.

And PLEASE look at that egr-to-supercharger air tube. I have two tubes sitting in my garage right now that have cracks where you can't see them when on the vehicle.
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Old 09-19-2007, 12:58 PM   #60
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do i have to take the tube off to check it.
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