Rough Idle - Help me put this subject to rest... Finally!
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Senior Member
Joined: Apr 2001
Posts: 725
Likes: 1
From: Norhtern NJ
Rough Idle - Help me put this subject to rest... Finally!
Hey people,
First off my car is an 86 LB9/700R4 with its cat-back removed.
My problem is the car has a pretty rough idle while in N or P, and a VERY rough idle when its in gear. I mean its at about 400-500rpms and the whole car shakes a lot.
When the engine warms up (220* or so) the idle at Park becomes OK but it remains exactly the same when the car is in gear. To make problems worse it bogs off a dead stop and the engine is very reluctant to rev up.
I think I narrowed it down to these prolems, please tell me which is the culprit:
- The ignition system: The plugs havent been changed since I got the car, the wires were changed but they lay around for a LONG time before I put them in and might bad.
- I have a vacuum leak. How do I fix this? Tighten all the bolts and hoses leading to intake and manifold?
- Exhaust system: Either the fact that I have my cat-back off or that my cat converter is plugged (and rusted on)
- Lack of oil pressure
- Cracked head, explains idle getting smotther when engine heats up, expands, and seals the crack
Please please somebody help me, I have been trying to get this car streetable on a very tight budget and this problem just keeps tripping me up.
BTW IS 30psi of oil pressure too little or acceptable?
-Max
First off my car is an 86 LB9/700R4 with its cat-back removed.
My problem is the car has a pretty rough idle while in N or P, and a VERY rough idle when its in gear. I mean its at about 400-500rpms and the whole car shakes a lot.
When the engine warms up (220* or so) the idle at Park becomes OK but it remains exactly the same when the car is in gear. To make problems worse it bogs off a dead stop and the engine is very reluctant to rev up.
I think I narrowed it down to these prolems, please tell me which is the culprit:
- The ignition system: The plugs havent been changed since I got the car, the wires were changed but they lay around for a LONG time before I put them in and might bad.
- I have a vacuum leak. How do I fix this? Tighten all the bolts and hoses leading to intake and manifold?
- Exhaust system: Either the fact that I have my cat-back off or that my cat converter is plugged (and rusted on)
- Lack of oil pressure
- Cracked head, explains idle getting smotther when engine heats up, expands, and seals the crack
Please please somebody help me, I have been trying to get this car streetable on a very tight budget and this problem just keeps tripping me up.
BTW IS 30psi of oil pressure too little or acceptable?
-Max
Junior Member
Joined: Jun 2001
Posts: 50
Likes: 0
From: New Jersey
i had that problem when i first put the engine back in mine. didnt have the vaccum lines run correctly and plus we had some leaks in them. so i would take a look at all your vaccum line hoses. they are all over the place.
goodluck
------------------
87 305 5.0 litre 4 bbl
Black with gray trim almost done being rebuilt
goodluck
------------------
87 305 5.0 litre 4 bbl
Black with gray trim almost done being rebuilt
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