Hey guys, I just got my 91 turbo mk3 to run agian. The only problem I have is that it doesnt idle right. It sometimes stays at like 500 goes up to 700 then drops back down etc.. I just put on a new 57 trim, ported 3 inch turbo elbow and 2.5 intercooler pipes and a spearco style intercooler. There is no airfilter on the stock maf because I dont have an adaptor to put one on since I broke my other one and im also running open downpipe. I looked at all vaccum lines they are all connected on the turbo side since I didnt touch the intake side. Does anybody know what can cause my idle to hunt like it does? Thanks alot.
Rpms hunt at idle
- Thread starter JoeSupra
- Start date
even a very tiny hole can jack with your system. i had a vacume leak not too long ago my vac was readin fine and it wasnt untill i acctually stuck my head rite next to the manifold that i heard a slight hiss. the only other thing i can guess is that because you dont have a filter that you may have gunked up or damaged the afm some how but then the car would be screwy all across the RPM range
mine is doing the same. I have an air filter on mine two. Drives fine when opened up just idling crap.
runs like this when its cold ? or all the time ? if its all the time check the cold start injector dont ask just trust me
get a airfilter that will most likely fix it, i know if i dont have mine on it idles like doo doo
im not trying to thread jack here but when my car is ideling (when i can get it to idel that it) the boost guage it at 0 when i give it gas it goes down then when it boosts up its fine oh and my car runs like crap to except when i get on the and after 2500 or 3k its perfect... but shouldent by boost guage be reeding some vac when idoling?
the tb gasket is brand new... i think im jus gana go through all the vac lines and make shure there all good...
Well it I think I fixed the problem. I put my exhaust on, tightened up all the intercooler pipes and put the air filter on. It runs soooo nice. Thanks guys.
lppro said:
refer to my post on page one... it will find any boost/vacum leak you have. nuff said
If it idles like crap, and worse when its warm
yet runs fine with some throttle
its a vacuum leak.
grab some ether (starting fluid), and spray it around at various points, until you hear the rpms drop or raise (prolly raise). It can be VERY subtle. I did this on a customers Caddy the other day at work, found it quickly.
yet runs fine with some throttle
its a vacuum leak.
grab some ether (starting fluid), and spray it around at various points, until you hear the rpms drop or raise (prolly raise). It can be VERY subtle. I did this on a customers Caddy the other day at work, found it quickly.