87 Vett with issues...
Thread Starter
Heel & Toe
Joined: Nov 2005
Posts: 19
Likes: 6
87 Vett with issues...
Working on a friends 87 Vette auto, 160K. Was running fine and while cruising it stuttered and started loosing power. It now starts runs and revs up fine, but you put it in gear under load it does the same thing.
These are the parts that have been replaced trying to solve the problem:
Cap
Rotor
Wires
Plugs
Coil
Fuel Pump
Filter
O2
TPS
MAF
Ignition module removed and tested at Autozone, good.
Sounds to me to be a timing issue?
HELP
Thanks
-Mike
These are the parts that have been replaced trying to solve the problem:
Cap
Rotor
Wires
Plugs
Coil
Fuel Pump
Filter
O2
TPS
MAF
Ignition module removed and tested at Autozone, good.
Sounds to me to be a timing issue?
HELP
Thanks
-Mike
Last edited by IcantDo55; Jul 25, 2008 at 04:18 PM.
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
1st - quit throwing parts until you know the issueget a FSM
2nd - quit throwing parts until you know the issueuse the search function
3rd - quit throwing parts until you know the issuequit throwing parts until you know the issue
4th - quit throwing parts until you know the issuecheck for codes
2nd - quit throwing parts until you know the issueuse the search function
3rd - quit throwing parts until you know the issuequit throwing parts until you know the issue
4th - quit throwing parts until you know the issuecheck for codes
Thread Starter
Heel & Toe
Joined: Nov 2005
Posts: 19
Likes: 6
Thanks
Its not my car, just got to be the lucky one working on it. All parts were installed by owner.
Search came up with all the parts that have been replaced before.
No codes.
Last edited by IcantDo55; Jul 25, 2008 at 05:07 PM.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
What do you mean by, "...put it in gear under load and it does the same thing"? When you rev an engine, the engine is under load. You can check the spark timing with a timing light. At night, defeat the underhood lights and engine idling, look along each plug wire for sparks. You shouldn't see any. Replace any plug wire looms that are broken or missing and dress plug wires to not touch metal. Plug wires have microscopic pinholes in them and if touching metal, will spark there instead of at the plug gap. Measure the fuel pressure at the shrader valve on the right side fuel rail at its rear. It should be about 40 psi and stay there when you put it in gear and load the engine.
Thread Starter
Heel & Toe
Joined: Nov 2005
Posts: 19
Likes: 6
Thread Starter
Heel & Toe
Joined: Nov 2005
Posts: 19
Likes: 6
Went over the car again and fixed a few small vacuum leaks but nothing major. Than let it idle in the driveway in 95* temps for an hour, all is fine. Took it out for a drive and after about 3 miles of low speed driving water temp hit 209* and it lost all power??? Barely made it home at idle.
My opinion is that it seems fuel related because it did not have the violent cutting out of a spark related problem. Felt down on power like it was out of fuel. Is there an easy way to monitor fuel pressure while driving?
Ideas please?
Barely made it home at idle. My opinion is that it seems fuel related because it did not have the violent cutting out of a spark related problem. Felt down on power like it was out of fuel. Is there an easy way to monitor fuel pressure while driving?
Ideas please?
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
Went over the car again and fixed a few small vacuum leaks but nothing major. Than let it idle in the driveway in 95* temps for an hour, all is fine. Took it out for a drive and after about 3 miles of low speed driving water temp hit 209* and it lost all power??? Barely made it home at idle.
My opinion is that it seems fuel related because it did not have the violent cutting out of a spark related problem. Felt down on power like it was out of fuel. Is there an easy way to monitor fuel pressure while driving?
Ideas please?
Barely made it home at idle. My opinion is that it seems fuel related because it did not have the violent cutting out of a spark related problem. Felt down on power like it was out of fuel. Is there an easy way to monitor fuel pressure while driving?
Ideas please?
This is for L98; I'm not sure what spec is for the test. Search the forum my posts for TUNING TPI ARTICLE...
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Thread Starter
Heel & Toe
Joined: Nov 2005
Posts: 19
Likes: 6
Did that, and it lost fuel pressure. Think the pump bad. Or something running the pump. New pump, go figure. Can a relay be an intermittent problem when it gets hot? Is there some other electrical issue I should be looking for? Or should I just replace the pump again?
Thread Starter
Heel & Toe
Joined: Nov 2005
Posts: 19
Likes: 6
Problem solved. And for all you on the edge of your seats....The guy who installed the fuel pump put the sock on wrong and it fell off and he also used MUCH to MUCH RTV to seal the fuel pump into the tank and it dripped into the fuel. The fuel pump with out sock installed had about a 1/2" screen to draw through and got clogged up with a chunk of RTV causing it to run like crap. So after cleaning the tank out and replacing the sock it runs great again.
Thanks for all the help!
Thanks for all the help!
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
Problem solved. And for all you on the edge of your seats....The guy who installed the fuel pump put the sock on wrong and it fell off and he also used MUCH to MUCH RTV to seal the fuel pump into the tank and it dripped into the fuel. The fuel pump with out sock installed had about a 1/2" screen to draw through and got clogged up with a chunk of RTV causing it to run like crap. So after cleaning the tank out and replacing the sock it runs great again.
Thanks for all the help!
Thanks for all the help!