sparkscarz

hey guys. i just bought this 88 turbo 2 , it wont stay idling. as soon as u let it drop before 1500 it will die . unless u keep ur foot on the gas :S
also it has a slight exhaust leak before the cat, i dont know if that has anything to do with it
also a very slight hesitation before 2grand
tps maybe...vacum leak?
please help anyone

88fc3sT2

iTrader: (1)

I'd spray some wd40 or something on the vac lines or anywhere that air is being sucked in through. If nothing changes, I'd swap out the tps.

Or maybe it has something to do with the throttle body, like where the throttle assembly is. Just a few ideas.

Sulzener Racing

Make sure your throttle cable is tight. I know on mine it won't stay tight causing it not to idle

wthdidusay82

iTrader: (15)

could be something stupid that's electronic like a sensor with a bad connection or that's bad period or both

sparkscarz

i was thinking its the tps. cause it has hesitation . they also might be some vacuum leaks

wthdidusay82

iTrader: (15)

well my would start and shutoff unless i revved to 2500rpm and i found outi had a bad Iat sensor (intake air temperateure) and a bad connection on the thermal sensor(located on the back of the water pump).

I fixed both those and it was fine.

You will want to set your tps to 1 volt with the key on and the car not running.

I still have not got my bac valve to operate but I am hoping to fix that in the future.

clokker

iTrader: (2)

The car will idle with no cable attached.
Idle speed is not determined by cable tension.

wthdidusay82

iTrader: (15)

yep u can idle with it not even attached cuz I've done it haha

sparkscarz

hey guys i actually found some vacuum leaks and i found cracks on the intake tube that is letting in UNMETERED air after the MAF... also i noticed the O2 sensor wire is missing .... would any of these have a factor with it not idleing ? ....oh and i checked and set my tps at 1 volt

wthdidusay82

iTrader: (15)

the un metered air will definitely affect your cars idle and make it not want to idle and will require you to raise the idle higher to compensate

you'll need to replace or repair the item that's cracked.

clokker

iTrader: (2)

I'll just assume this is a rhetorical question.

Because, duh.

sparkscarz

hey guys just an update, i fixed all the vacuum leaks and the unmetered air leaks. set my tps and checked my egr. and it still doesn't idle. im yet to find the wire that i suppose to go to my o2 sensor.... would not having a o2 reading make it not idle??? i thought OBD1 didnt care out O2 readings....
also i suspect a fuel pressure issue...maybe the pleasure regulator is bad?
im really frustrated with this...

satch

iTrader: (1)

You would have to pull codes using a pair of LED lights to see if the ECU is recognizing the unconnected sensor but the Oxygen sensor is not used for idling purposes. You also might have clogged primary injectors. Your AFM might be the culprit as well.

mazdaverx713b

iTrader: (91)

have you checked and tested the air control valve? they have been known to fail. you will also want to check the wiring to and test your coolant temp sender and water temp switch.