Rough to no idle with cold engine

helfmann

helfmann

New member
Honestly the problem started after I put the “Typhoon” logo plate on my intake.
In the morning my Ty does not idle 8 out of 10 times. I have to “hold” the RPM at 1200-1500 for 20 sec to 2 minutes and after it heated up the lady is running fine.
I notices, with warm engine, my idle vacuum is at the last bottom third of the stock boost gage and at 0.65 bar (~ -9PSI) at my VDO. In the morning it reads in the first negative segment of the stock gauge and –0.45 -0.5 at the VDO. I removed the plate, checked the gasket yadayadayada, no chance.
If I don’t hold the RPM up, my ATR air/fuel reads rich (after it warmed) up a little bit, worst case I get the check engine light with different codes. After I cleared the codes everything is fine Any ideas?!?

Matthias
´92 black/black Ty #719 http://www.tyguy.net -à Warning strange language :smile:


<font size=-1>[ This Message was edited by: helfmann on 2002-02-10 00:38 ]</font>
 
B

BillC

New member
Hmm, it sounds like you've got a vacuum leak that goes away when the engine warms up. First thing I'd do is double-check the gasket under the plate and make sure it's sealing correctly. Check the plate to make sure it is absolutely flat. Then, look for vacuum leaks. Look for missing, loose or cracked fittings.

However, since the problem may be related to the new plate, try putting the old plate back on. If the problem goes away, then the new plate is the culprit. It might be possible that the new plate was machined incorrectly and has a pinhole leak or isn't completely flat.
Good Luck
 
G

GM TURBO

Sell Out
Was it the intake plate or the TB plate?

I know there were new intake plates made - which, in my mind, shouldn't have ANY way to create a vacuum leak. If it is a TB plate - I can see that. The gasket on mine came off somewhat easy - but if that ripped you could have a problem. Or if you didn't put the gasket on. When taking the TB off the Saturn for its spring cleaning in the winter, I got the gasket on only one of the screws and it went on crooked. This created a BIG problem where the RPMs climbed WAY high - and stupid me did it a couple times. I don't know what the result would be of having the TB Plate gasket off - but I am sure it would cause problems.
 
helfmann

helfmann

New member
Hi All!

I took the plate of and checked if it is straight ... was not 100%, so some minor trimming a a second gasket helped. Two days in a row now problem.
Thanks

M@
 
helfmann

helfmann

New member
No, I did not bump the IAT sensor, I guess it was just only 'cause the plate was not 100% straight. Right now the problem is almost gone (perhaps a second or two).
I got code 45 (too rich) which was easy to clear. Diacom (sorry no Datamaster yet) showed the same (high O2's)

Thanks
M@
 
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