fouling out the plugs
Thread Starter
Cruising
Joined: Feb 2015
Posts: 10
Likes: 0
From: Everett/Bullhead City Wa/Summers Az/Winters
fouling out the plugs
My 85 keeps fouling out the plugs with raw fuel. My mechanic just installed new injectors, new fuel pump and new computer... No help, now he's replacing the enricher injector but thinks it's Okay...any ideas?
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Is it fouling plugs in open or closed loop?
Could be a bad 02 sensor, coolest temp sensor..Needs to be hooked up to a computer to see what the problem is, this should always be the first step.......WW
Could be a bad 02 sensor, coolest temp sensor..Needs to be hooked up to a computer to see what the problem is, this should always be the first step.......WW
Last edited by WW7; Mar 4, 2015 at 09:38 PM.
Thread Starter
Cruising
Joined: Feb 2015
Posts: 10
Likes: 0
From: Everett/Bullhead City Wa/Summers Az/Winters
have no idea about an open or closed loop, but will ask about this and the 02 sensor in the morning...thanks
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Do you trust your mechanic?? It sounds like he's just throwing parts at the problem and not taking the right steps to find out what the problem really is....Why would he install a fuel pump, the fuel pump couldn't cause a rich condition. Unless the injectors are stuck open, it's very unlikely it's the injectors either. He could of tested to see if the injectors were leaking into the engine by just doing a leak down test..He's putting in very expensive parts (without testing) ,when it could end up being a $35.00 O2 sensor....If he hooked the car to a scanner he could get a better idea of what the problem is, and save you a ton of money...WW
Last edited by WW7; Mar 5, 2015 at 07:57 AM.
Race Director
Joined: Sep 2001
Posts: 10,560
Likes: 439
From: Wellington, FL
St. Jude Donor '11 thru '25
Do you trust your mechanic?? It sounds like he's just throwing parts at the problem and not taking the right steps to find out what the problem really is....Why would he install a fuel pump, the fuel pump couldn't cause a rich condition. Unless the injectors are stuck open, it's very unlikely it's the injectors either. He could of tested to see if the injectors were leaking into the engine by just doing a leak down test..He's putting in very expensive parts (without testing) ,when it could end up being a $35.00 O2 sensor....If he hooked the car to a scanner he could get a better idea of what the problem is, and save you a ton of money...WW
Is the car driven mostly in short trips?
Thread Starter
Cruising
Joined: Feb 2015
Posts: 10
Likes: 0
From: Everett/Bullhead City Wa/Summers Az/Winters
trust mechanic?
Do you trust your mechanic?? It sounds like he's just throwing parts at the problem and not taking the right steps to find out what the problem really is....Why would he install a fuel pump, the fuel pump couldn't cause a rich condition. Unless the injectors are stuck open, it's very unlikely it's the injectors either. He could of tested to see if the injectors were leaking into the engine by just doing a leak down test..He's putting in very expensive parts (without testing) ,when it could end up being a $35.00 O2 sensor....If he hooked the car to a scanner he could get a better idea of what the problem is, and save you a ton of money...WW
Thread Starter
Cruising
Joined: Feb 2015
Posts: 10
Likes: 0
From: Everett/Bullhead City Wa/Summers Az/Winters
short trips?
We just bought the car 3 months ago so know little about it. the car has only 39K miles so must assume alot of short trips. lady was the only owner, but she let here methhead convict son use the car. car was running on about 4 cylinders when we got it started and the oil was totally black. changed the oil and replaced the spark plugs and fuel filter before we drove off with it. 60 miles later it fouled out after we just barely made it home. been in the shop since, miss it big time...lol
Pro
Joined: Jan 2003
Posts: 706
Likes: 47
From: Denver Colorado
Check the Chip
From the thread info it sounds like you have not had the car for long and don't have a history. Is the chip the right (stock) one for the car or is it a "Hot Rod" job from long ago? Some of the hop up chips were not wonderful. It would not hurt to check the chip is stock if the O2 and the coolant temp sensor (the one that feeds the computer, not the one for the gauges) both check out ok. I'd be tempted to throw a coolant temp sensor at it anyway, the one in it now is likely to be 30 years old. 
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Thread Starter
Cruising
Joined: Feb 2015
Posts: 10
Likes: 0
From: Everett/Bullhead City Wa/Summers Az/Winters
From the thread info it sounds like you have not had the car for long and don't have a history. Is the chip the right (stock) one for the car or is it a "Hot Rod" job from long ago? Some of the hop up chips were not wonderful. It would not hurt to check the chip is stock if the O2 and the coolant temp sensor (the one that feeds the computer, not the one for the gauges) both check out ok. I'd be tempted to throw a coolant temp sensor at it anyway, the one in it now is likely to be 30 years old.
Thread Starter
Cruising
Joined: Feb 2015
Posts: 10
Likes: 0
From: Everett/Bullhead City Wa/Summers Az/Winters
thank you everyone for your input and suggestions...the good news; mechanic has got the car running just fine...the bad news; the car will not shift out of first gear and acts like it is going into neutral. have mentioned this on another thread and have gotten (i believe) some good information concerning that problem...still looking forward to not only owning a Corvette but to actually driving one...lol