87uk944t

having problems with the idle on my car, it is spluttering away and trying to die all the time, have checked all the vacuum lines ect and cant find anything obvious?? also when i rev my car to say 4000revs it holds there for a few seconds then very slowly decreases back down surely there must be something wrong there??
Any help would be greatly appreciated!!

Danno

Sounds like the idle-stabilizer may be going out? Although the sputtering and dying might be a intake hose leak somewhere. Check the big hose coming out of the turbo, it likes to split on the back side where you can't see it. Then the little connector hoses on the intercooler pipes are thin and can split parallel and underneath the hose-clamps. Then the big conical hose going into the throttle-body likes to slip off as well.

hosrom_951

If the car stays at 4,000 and SLOWLY revvs back down. SOunds like a throttle Position Switch (TPS). Did you play around in the throttle area? did you take that TPS off? it may need adjustment, loosen the two bolts and move the TPS into a position. Then open the throttle manualy, listen CAREFULLY for a slight clicking noise when opening and closing. If you do, that is when you tighten the bolts and hold the TPS in that position.

87uk944t

everything was just out to fit a new turbo so i guess the tps could have been moved, i just found a hole in my lbe so i have replaced that with a reliaboost i had lying around and my car does seem to be running better but still with the revving problem, the revs do not drop when changing gear so i dont think that my 17 year old clutch will last much longer if i dont get this sorted out soon!!!! i will try moving the tps into correct position, cheers for the help

87uk944t

just had a look at tps and could not hear any clicking when opening and closing throttle so i am assuming it must need reset, how the hell do you get to the bottom screw on that thing!! even removing some of the hoses doesnt help because there is a metal one right in front of it!!

87uk944t

right tps was a mile out, from one end of adjustment to the other, i guess that the garage must have moved it!! now my car is revving far better but my erratic idling problems seem to be worse than ever!! i must admit that while trying to get over problems i adjusted the idle screw, the idle stabilizer and that screw on the top of the throttle body( what the hells that for anyway??) so any tips on resetting these???

87uk944t

also just fitted guru chips the other day, my idling problems couldnt be anything to do with them could they??? Danno???

hosrom_951

So the TPS helped out? now the revvs don't stay anyway, the drop right? AS for the idle. Now you replaced the turbo, you check the vacuum lines, hmmm.....what EXACTLY is YOUR kind of bad idle? im sayiong this because bad idles mean revs up, down,up down....and so on. Idles on 800 for a while, rungs rough then pops back to normal. What are you experiencing with the idle to be more exact? As for the idle screw, yes it is the one on top of the throttle body. Turn off the car, screw that thing out and take a GOOD CLOSE look at it. here should be a rubber ring (seal) fused with the metal screw. Is your missing, deteriorated, not there?

hosrom_951

Please excuse my mis-spellings typing fast isn't always a good thing

87uk944t

yes adjusting the tps helped out with the revving problem, the revs dont hold now they just fall back down as quickly as they go up, as for my idle it goes as low as 200-300 rpm and tries to die completely then all of a sudden it picks up back to 800-1000rpm then back to 200-300 banging and popping then cuts out, so what exactly does that screw on top do to ur idle?? i will have to go and have and remove it and have a look and see if the o'ring is still in tact, i thought the one on the throttle cam with the locknut was for adjusting ur idle speed

MHT

the screw with the locknut is not there for adjusting the idle, it is a stop screw, it prevents the throttle blade from binding in the bore. To set that screw, back off the lock nut and the screw, tighten the scerw until it just begins to touch the throttle linkage, then turn it in an additional 1/4 turn, now lock it down and leave it alone. You might now have to re-adjust the TPS. To set the base idle, jumper the B and C terminals on the test plug and set the idle speed to 850 rpm, at this speed the engine speed should remain fairly steady as you disconnect and re-connect the jumper. If you have played with the by-pass screw in the air flow sensor, you will need to get access to an emissions analyzer and set the CO to about .8% measured before the cat with the oxygen sensor disconnected.
Good luck

87uk944t

right took that screw right out and had a look at the o'ring and it looks good no signs of deterioration at all, have been looking back at posts and it seems a couple of people have had idle problems with guru chips in the past, bought them quite some time back but have just fitted them along with new turbo and 55lb/hr injectors so will have to see if i can get some more info from Danno on these

87uk944t

ok i will reset the stop screw and reset the tps if required, i have not touched any bypass screw in the air flow sensor, can you give me more info on setting the idle please, wheres the test plug and how do i go about setting it to 850 rpm?? have never done anything with setting the idle speed before

K-bit

Check out the tech link on the Lindsey site

http://www.lindseyracing.com/Merchan...ode=TECHGARAGE

Hope this helps
Jack

hosrom_951

Hold on a minute. These chips are old? how old? and for 15 or 18 psi? on stock turbo K26/6 or K26/8 ? If you got a 'NEW' turbo, these chips may bot be mapped for it. Contact Danno and confirm with him. By the way, did you have this problem after the chip installation? or was it always there and only after the turbo upgrade?