Throttle cut out under boost, now it won't start
#1
Throttle cut out under boost, now it won't start
Ok, So I was driving very aggressively the other night; running with some motorcycles, doing about 135 @ 5000rpm's in 5th. Suddenly the throttle cut out, meaning that if I hit the gas at all it just bogged up and wouldn't accelerate, without the throttle it just decelerated like normal. So I limped over to the side of the road to try to restart it. ( I thought I had just gone into limp mode maybe?) But now it doesn't start.... correction... it starts but it is just a quick start: she turns over and starts but then immediately dies. I can't even give it gas to rev it up. I popped the hood and with my trusty flashlight gave the engine a quick look over. As far as I could see being dark and having a crappy flashlight, vac lines were good. My next thought was the throttle... and there it was, one of the throttle cables seemed to have become unseated. After some fighting with a hot manifold i finally got the cable re-seated but the damn thing still does these quick starts and won't hold an idle. I did some searching and have come up with three (albeit somewhat ignorant) ideas: (1) Vac line I'm not seeing somewhere, (2) Intercooler coupling popped off (3) Something bad with the throttle body (4) AFM (5) Blew the engine
School just started again so I haven't had time really look into these, just trying to get an idea of what to look for when I do get to check it out.
Any other ideas?
1989 Turbo II
Mods:
FMIC
720cc secondaries
Walbro 255
no power steering
no A/C
no smog pump
all emissions removed
3" downpipe
S-AFC II
Greddy Boost Controller
PYX Wideband
School just started again so I haven't had time really look into these, just trying to get an idea of what to look for when I do get to check it out.
Any other ideas?
1989 Turbo II
Mods:
FMIC
720cc secondaries
Walbro 255
no power steering
no A/C
no smog pump
all emissions removed
3" downpipe
S-AFC II
Greddy Boost Controller
PYX Wideband
Last edited by texFCturboII; 08-28-07 at 12:49 PM.
#6
Sounds like you just blew off a vacuum line. Check the brake booster line on the back of the UIM, as well as the intercooler => throttle body hose. That one always liked to pop off on me under boost.
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#10
Haven't checked it yet, I've got class until tomorrow evening at which point i will roll it off the trailer and take another look at it. Boost- I was running 11lbs. boost on the stock turbo. My first thought is a loose line as well, so I will be meticulous. What threw me off though was the throttle cable! (I'm assuming it was a throttle cable.) First off I didn't know that we had two of them! Second, to get the cable to reseat I had to wrap the little ball at the end in electric tape; there was about a 1/4 of play in it.
#13
Ok, so checked it out today after classes and it looks like the IC piping is good, I replaced the AFM, and all the vac lines that I could really see were on. So tomorrow I guess I am going to take of the UIM and really get behind and see if there are lines that I am missing just hanging about. Any pointers when taking off the UIM?
#15
She Lives!!!
Woo Hoo!! Ok, so i got the UIM off and checked all the vac lines, everything was good (as it should be, they are all brand new). As i went to put back on the intercooler to intake pipe I noticed that one of the pipes had blown loose. Ya'll were correct, it was just a pipe from the intercooler. She started up and runs just fine, thanks for the help peeps!
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trickster
2nd Generation Specific (1986-1992)
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