Help!! Problem with starting and idle.
Thread Starter
Intermediate
Joined: Oct 2004
Posts: 30
Likes: 0
From: Macclenny FL
Help!! Problem with starting and idle.
This is my first post. i have a 90 vette, auto, and in the morning it is hard to start. It takes at least 2 times before it starts and then the idle is rough until it warms up then it idles fine. It is a rebuilt engine with 11,000 miles on it. I have tried everything I can think of with no change. PLEASE HELP!
Thread Starter
Intermediate
Joined: Oct 2004
Posts: 30
Likes: 0
From: Macclenny FL
It has new injectors, new cap, rotor, plugs, plug wires, fuel pressure is at 40 psi, new map sensor, new fuel pump, fuel filter. o2 sensor is new, throttle body is new, the iac came with the car and tps is 4 months old.
Burning Brakes
Joined: Jun 2003
Posts: 949
Likes: 0
From: smithtown ny
well i know the oil pressure sensor works with the fuel pump it will build oil pressure than the car will start. my car takes a crank or 2 then it starts. everything is new also. my car also runs a little rough when cold then once it goes into closed loop it runs smooth.the o2 senser has to reach about 600 degrees before the ecm and o2 work together. do you have a scanner??
Thread Starter
Intermediate
Joined: Oct 2004
Posts: 30
Likes: 0
From: Macclenny FL
I do not have a scanner. The car is really idling bad around 400-1100 rpm , revs up and down for at least 15 mins then runs smooth. i have had the car on the road for a year and it has never acted like this.
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Originally Posted by 90pologreen
This is my first post. i have a 90 vette, auto, and in the morning it is hard to start. It takes at least 2 times before it starts and then the idle is rough until it warms up then it idles fine. It is a rebuilt engine with 11,000 miles on it. I have tried everything I can think of with no change. PLEASE HELP!
Does the 90 motor have a ninth injector like the early L98's?
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Thread Starter
Intermediate
Joined: Oct 2004
Posts: 30
Likes: 0
From: Macclenny FL
No it doesnt have a 9th injector, i mean every thing that is involved in a tune up. It started this 2 weeks after i put new injectors in the car. I check to see if i forgot a vaccum line or bolt was loose nothing.
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 60
From: Fremont Oh
90 polo,
if you slightly put your foot onthe accellerator does it smoothen out?
It could be the IAC I know you say you cleaned it etc but perhaps it isn't adjusted prolerly, there is a adjustment sequence in the helms that could perhpas br your problem.
I had asituation where mine froze up and the car in the morning would start and stall... start and stall.. but once it was warmed up it was fine... This sounds alot like that scenerio..
Hope this helps
Mo
if you slightly put your foot onthe accellerator does it smoothen out?
It could be the IAC I know you say you cleaned it etc but perhaps it isn't adjusted prolerly, there is a adjustment sequence in the helms that could perhpas br your problem.
I had asituation where mine froze up and the car in the morning would start and stall... start and stall.. but once it was warmed up it was fine... This sounds alot like that scenerio..
Hope this helps
Mo
