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Old 07-25-2003, 10:28 AM   #1
QfactorRS
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Angry low boost and low vac.

Dudes

on my way to work, car wouldn't boost above 3psi, felt like a hog.

then i noticed that i wasn't getting any positive pressure until above 4k rpm!!

Also, no fuel pressure increase when i hit boost, and vaccum numbers stay at 10 at idle. car runs fine tho.

i assumed a vaccum leak somewhere, but i haven't had time to check the engine bay, but couldn't here the usual vaccum leak sound. I'll check at lunch time.

Q
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Old 07-25-2003, 10:37 AM   #2
rhdude
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check all the vacuum lines, I had one of the ones running to my intake before the turbo fall off, vacuum dropped and could'nt get more than 3psi..
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Old 07-25-2003, 11:53 AM   #3
dyswtric27
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im going to guess vac line to the fpr
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Old 07-25-2003, 12:14 PM   #4
Darshu
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Check the wiring to your coilpack. It sounds like you're running on two cylinders. You've got a J&S right? If one of the leads to the ignitor isn't solid, you'd drop a pair of cylinders.
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Old 07-25-2003, 12:23 PM   #5
dyswtric27
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darshu good idea, if the car idles real rough and revs real slow when free revving then you are running on 2 cylinders. I ran on 3 cylinders for a little while until i realized that one of my injectors was not connected and it was running like crap.
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Old 07-25-2003, 12:56 PM   #6
Mancini
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Also check all your hose clamps. This past weekend I had one vibrate loose. Started with a loss of boost. Moved till I couldn't rev past 3000 at anything other than part throttle. Before I could even get home it blew completely and the car died. Just double check that your clamps are tight and your connectors aren't leaking.
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Old 07-25-2003, 01:20 PM   #7
Darshu
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dyswtric27- Yeah, though, funny enough, the engine will run reasonably smoothly on 2 cylinders since the each of the two coilpacks fire opposing cylinders, the motor won't appear to run as rough on 2 opposing cyls as it will with 3 cyls.

(I was down on two cylinders at one point due to a bad connection too )
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Old 07-25-2003, 02:30 PM   #8
QfactorRS
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Fixed the problem at lunch.

It was a crack in the vaccum line going to my boost gauge, which is also connected to my rrfpr.

it must have crack during the swap, pinched under something maybe.

anyway, i fixed it with electrical shrink wrap for now, i'll replace the hose tonight when i get home.

thanks for all the diagnostics.

Q
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