Intake Manifold Gasket failed?
Thread Starter
2nd Gear
Joined: Sep 2011
Posts: 2
Likes: 0
From: Fort Lauderdale FL
Intake Manifold Gasket failed?
I have a 1990 / L98 Coupe
After the engine has been running for a while there is smoke coming from underneath the car. Smells like oil. I suspect dripping on the exhaust pipe.
After running and the car is in the garage, there is a smell of coolant, but I do not see any leaks. I do not seem to lose any coolant. Small amount of steam/very ligh smoke coming from distributor area.The car always runs at 160 due to a previous owner installing a performance chip.
I don't know it is related, but I have small drips of transmission fluid on the garage floor.
My guess is that the intake manifold seal/gasket is bad and needs to be replaced. My only concern is the real problem intake seal, main seal, etc.
Does this sound like I am on the right track and how can I be reasonably sure which is the problem?
Thanks for your help!!
After the engine has been running for a while there is smoke coming from underneath the car. Smells like oil. I suspect dripping on the exhaust pipe.
After running and the car is in the garage, there is a smell of coolant, but I do not see any leaks. I do not seem to lose any coolant. Small amount of steam/very ligh smoke coming from distributor area.The car always runs at 160 due to a previous owner installing a performance chip.
I don't know it is related, but I have small drips of transmission fluid on the garage floor.
My guess is that the intake manifold seal/gasket is bad and needs to be replaced. My only concern is the real problem intake seal, main seal, etc.
Does this sound like I am on the right track and how can I be reasonably sure which is the problem?
Thanks for your help!!
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
I have a 1990 / L98 Coupe
After the engine has been running for a while there is smoke coming from underneath the car. Smells like oil. I suspect dripping on the exhaust pipe.
After running and the car is in the garage, there is a smell of coolant, but I do not see any leaks. I do not seem to lose any coolant. Small amount of steam/very ligh smoke coming from distributor area.The car always runs at 160 due to a previous owner installing a performance chip.
I don't know it is related, but I have small drips of transmission fluid on the garage floor.
My guess is that the intake manifold seal/gasket is bad and needs to be replaced. My only concern is the real problem intake seal, main seal, etc.
Does this sound like I am on the right track and how can I be reasonably sure which is the problem?
Thanks for your help!!
After the engine has been running for a while there is smoke coming from underneath the car. Smells like oil. I suspect dripping on the exhaust pipe.
After running and the car is in the garage, there is a smell of coolant, but I do not see any leaks. I do not seem to lose any coolant. Small amount of steam/very ligh smoke coming from distributor area.The car always runs at 160 due to a previous owner installing a performance chip.
I don't know it is related, but I have small drips of transmission fluid on the garage floor.
My guess is that the intake manifold seal/gasket is bad and needs to be replaced. My only concern is the real problem intake seal, main seal, etc.
Does this sound like I am on the right track and how can I be reasonably sure which is the problem?
Thanks for your help!!
valve gaskets, oil senders -2- and the tee, also dist gasket can all leak. if it is burning you can trace it pretty easy before making a major repair.
Thread Starter
2nd Gear
Joined: Sep 2011
Posts: 2
Likes: 0
From: Fort Lauderdale FL
Oil / Coolant leak
oils and coolant odors sounds like intake gaskets. I have heard that you can retorgue intake bolts to spec -or close- 35 ft lbs, and can solve the coolant leakage. if yours are not nociceably loose that prob won't work. esp center bolts. these are sealing gaskets and don't blow out.
valve gaskets, oil senders -2- and the tee, also dist gasket can all leak. if it is burning you can trace it pretty easy before making a major repair.
valve gaskets, oil senders -2- and the tee, also dist gasket can all leak. if it is burning you can trace it pretty easy before making a major repair.
Thanks to all!!
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I don't know if it still existed in the '90 cars, but on my '86 there is a small tube and hose that goes from the heater bypass valve over to the back of the intake manifold near the distributor (passenger side). On my car the hose developed a pinhole leak that would only happen when the car was hot.
