93 vette please help
Thread Starter
Racer
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
93 vette please help
My car sat for four weeks,and when I started I got a miss and black smoke.I changed the plugs they turned black also.Plugged up scaner
It read 75 on the left oxygen senor and 300 on the right,Should I re place the sensor.This is a 383,with a custom prom. I also messed with the throttle position sensor.How do I get this back correct?
It read 75 on the left oxygen senor and 300 on the right,Should I re place the sensor.This is a 383,with a custom prom. I also messed with the throttle position sensor.How do I get this back correct?
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Not sure about the 02 sensors. You may have a leaky or sticking injector(s) causing a rich condition on one side. Do a leakdown test on your injectors before just replacing the 02 sensor(s). You can also hear a sticking injector with a mechanics stethoscope. Listen to them at idle for a steady "tica tica tica". If one stops or pauses it's sticking.
CF member 65Z01's website has good instuctions for service of IAC and setting TPS among other helpful tips. Check it out here...
http://www.geocities.com/jgkov/index.html
CF member 65Z01's website has good instuctions for service of IAC and setting TPS among other helpful tips. Check it out here...
http://www.geocities.com/jgkov/index.html
Thread Starter
Racer
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
93 vette
Originally Posted by skateparkdave
Not sure about the 02 sensors. You may have a leaky or sticking injector(s) causing a rich condition on one side. Do a leakdown test on your injectors before just replacing the 02 sensor(s). You can also hear a sticking injector with a mechanics stethoscope. Listen to them at idle for a steady "tica tica tica". If one stops or pauses it's sticking.
CF member 65Z01's website has good instuctions for service of IAC and setting TPS among other helpful tips. Check it out here...
http://www.geocities.com/jgkov/index.html
CF member 65Z01's website has good instuctions for service of IAC and setting TPS among other helpful tips. Check it out here...
http://www.geocities.com/jgkov/index.html
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
You need a fuel pressure tester similar to this one.
http://www.actron.com/product_detail.php?pid=16175 You can pick one up at most auto parts stores for under $30
You put it on the shrader valve on fuel rail and start motor and check fuel pressure. Then you kill the motor and watch for a drastic drop in pressure over say a half hour. Any fast drop in pressure indicates a problem. You can leave it over night and if it drops slowly down to say 0 to 5-10 psi from the original running 39-43 psi then you have a slow leaking injector(s). Dropping to say 25 psi or so overnight is normal as long as it doesn't drop there quickly. Again, listening to injectors with a stethoscope can be a valuable tool. If an injector is sticking open intermittently while running it can cause a rich condition with the symptoms you decsribe.
I'm not saying you definetly have injector trouble but with the symptoms you described it needs to be checked.
Good luck and let us know what you find.
http://www.actron.com/product_detail.php?pid=16175 You can pick one up at most auto parts stores for under $30
You put it on the shrader valve on fuel rail and start motor and check fuel pressure. Then you kill the motor and watch for a drastic drop in pressure over say a half hour. Any fast drop in pressure indicates a problem. You can leave it over night and if it drops slowly down to say 0 to 5-10 psi from the original running 39-43 psi then you have a slow leaking injector(s). Dropping to say 25 psi or so overnight is normal as long as it doesn't drop there quickly. Again, listening to injectors with a stethoscope can be a valuable tool. If an injector is sticking open intermittently while running it can cause a rich condition with the symptoms you decsribe.
I'm not saying you definetly have injector trouble but with the symptoms you described it needs to be checked.
Good luck and let us know what you find.
Last edited by skateparkdave; Dec 27, 2005 at 03:07 PM.
Thread Starter
Racer
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
thanks
Originally Posted by skateparkdave
You need a fuel pressure tester similar to this one.
http://www.actron.com/product_detail.php?pid=16175 You can pick one up at most auto parts stores for under $30
You put it on the shrader valve on fuel rail and start motor and check fuel pressure. Then you kill the motor and watch for a drastic drop in pressure over say a half hour. Any fast drop in pressure indicates a problem. You can leave it over night and if it drops slowly down to say 0 to 5-10 psi from the original running 39-43 psi then you have a slow leaking injector(s). Dropping to say 25 psi or so overnight is normal as long as it doesn't drop there quickly. Again, listening to injectors with a stethoscope can be a valuable tool. If an injector is sticking open intermittently while running it can cause a rich condition with the symptoms you decsribe.
I'm not saying you definetly have injector trouble but with the symptoms you described it needs to be checked.
Good luck and let us know what you find.
http://www.actron.com/product_detail.php?pid=16175 You can pick one up at most auto parts stores for under $30
You put it on the shrader valve on fuel rail and start motor and check fuel pressure. Then you kill the motor and watch for a drastic drop in pressure over say a half hour. Any fast drop in pressure indicates a problem. You can leave it over night and if it drops slowly down to say 0 to 5-10 psi from the original running 39-43 psi then you have a slow leaking injector(s). Dropping to say 25 psi or so overnight is normal as long as it doesn't drop there quickly. Again, listening to injectors with a stethoscope can be a valuable tool. If an injector is sticking open intermittently while running it can cause a rich condition with the symptoms you decsribe.
I'm not saying you definetly have injector trouble but with the symptoms you described it needs to be checked.
Good luck and let us know what you find.
Thread Starter
Racer
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
93 vette
I fuel pressure went to 10.What size injectors come on a 93 Lt-1.
Are the accel injectors any good,they come in two sizes.30 and 36.What can I expect to pay for a set?What about repair of these.?
Are the accel injectors any good,they come in two sizes.30 and 36.What can I expect to pay for a set?What about repair of these.?
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
Pull the regulator vacuum hose and check for a gas smell.Leaky injectors are not the only way to lose pressure.What was the original pressure before leakdown?
Last edited by Redeasysport; Dec 30, 2005 at 10:05 AM.
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Thread Starter
Racer
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
93
Originally Posted by Redeasysport
Pull the regulator vacuum hose and check for a gas smell.Leaky injectors are not the only way to lose pressure.What was the original pressure before leakdown?
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Originally Posted by calvette 11
I fuel pressure went to 10.What size injectors come on a 93 Lt-1.
Are the accel injectors any good,they come in two sizes.30 and 36.What can I expect to pay for a set?What about repair of these.?
Are the accel injectors any good,they come in two sizes.30 and 36.What can I expect to pay for a set?What about repair of these.?
There are places that rebuild the stock injectors but I've never dealt with any personally. Maybe someone will chime in.
If you smell fuel in the fpr's vacuum line then maybe it's time for a new set of injectors and an adjustable fpr. In my opinion Holley makes the best one. Then you can adjust the pressure to suit your tune.
By the way, you dont want 30 or 36 lb/hr injectors unless the lt1 calls for them or you are built for that much flow or you'll have one pig rich puppy on your hands. But check first. I may be wrong but wasn't aware of it if lt1's had that large of injectors.
Thread Starter
Racer
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
thanks
The screw of the adjustable pressure regulator was loose.I replaced the left oxygen sensor and it run real good.It took the computer a few mintues to learn every thing.It is fixed thanks to everybody.
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Ahhh, the old loose screw in the AFPR trick. 
So you already have an adjustable one , eh? Well, glad the injectors are ok and your up and running. Thanks for reporting back.
So you already have an adjustable one , eh? Well, glad the injectors are ok and your up and running. Thanks for reporting back.
Last edited by skateparkdave; Jan 6, 2006 at 02:00 AM.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
Originally Posted by calvette 11
The screw of the adjustable pressure regulator was loose.I replaced the left oxygen sensor and it run real good.It took the computer a few mintues to learn every thing.It is fixed thanks to everybody.