Throttle Question
Thread Starter
Heel & Toe
Joined: May 2005
Posts: 21
Likes: 0
Throttle Question
Just bought a 1987 Vette with 4+3 trans. The car is real quick and fun but I am having trouble with the throttle. When not started the trottle linkage operates smoothly with no apparent problems. When the car in running the trottle is tight and then jumps up and rev's high, almost all or nothing. (No smooth increase in RPM's) Also, it does not return to idle position all the time, probably only 1/4 of the time and only when I hit the gas and let off quickly. Again, the linkage seems fine with the car not running. Snaps back to idle position, no kinks or binding anywhere.
Maybe the spring on the throttle body is not tight enough??
It has been very hairy backing into my tight garage.
Please help.
Maybe the spring on the throttle body is not tight enough??
It has been very hairy backing into my tight garage.
Please help.
Thread Starter
Heel & Toe
Joined: May 2005
Posts: 21
Likes: 0
Originally Posted by rws.1
Does the DIC show any codes?
It could be a faulty Throttle Position Indicator Check the connections first to ensure they are tight and not corroded.
It could be a faulty Throttle Position Indicator Check the connections first to ensure they are tight and not corroded.
Race Director
Joined: Jul 2004
Posts: 16,795
Likes: 62
From: Lake Havasu City, AZ
DIC is Driver Information Center. The part of the dash that lights up when you turn the key to the on position just before the engine cranks.
Its the part that tells you whether you have problems with your ABS, or Airbags etc.
If your car has an electronic problem... it will "throw a code" this is what the technicians read .
You can buy a code reader or you can use a paper clip or Autozone gives away free code keys.
Follow this link below: read the thread about how to read a code ( Reading the first 5 posts will give you all you need to know)
the code will help diagnose the area in which the problem is occuring.
Once you have the code post it here and your fellow CFers will help you pinpoint the problem and advise how to fix it.
good Luck
http://forums.corvetteforum.com/show...es&forum_id=48
Its the part that tells you whether you have problems with your ABS, or Airbags etc.
If your car has an electronic problem... it will "throw a code" this is what the technicians read .
You can buy a code reader or you can use a paper clip or Autozone gives away free code keys.
Follow this link below: read the thread about how to read a code ( Reading the first 5 posts will give you all you need to know)
the code will help diagnose the area in which the problem is occuring.
Once you have the code post it here and your fellow CFers will help you pinpoint the problem and advise how to fix it.
good Luck
http://forums.corvetteforum.com/show...es&forum_id=48
Team Owner
Joined: Jan 2003
Posts: 20,306
Likes: 242
From: Summerland B.C. Canada
Pull the air inlet tube and see how much crud has built up in the TB bore and on the edges of the butterflies. Also check for play in the throttle shaft. In time the bore gets elongated and the shaft is allowed to move back and forth causing the butterflies to come to a rest in different positions. Dave Koldos does TB rebuilds and machines a bearing into each end of TB. Cleaning the TB including the IAC passage may yield good results. Follow this with setting the min. idle and TPS.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
The throttle body is worn, where the throttle shaft passes through it. If you spray where the shaft goes into the casting at both ends, with a lube, you may get a temporary cure. The TB either has to be repaired with bushing or bearings, or the TB replaced.
RACE ON!!!
RACE ON!!!
Team Owner
Joined: Jan 2003
Posts: 20,306
Likes: 242
From: Summerland B.C. Canada
Originally Posted by BRB
TPS????
https://www.corvetteforum.com/techti...D=55&TopicID=2
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Thread Starter
Heel & Toe
Joined: May 2005
Posts: 21
Likes: 0
Duh!! I had TPS in my mind, I assume TPI is the same thing.
You guys are good. Sprayed some lube inside the throttle body right at the "butterfly axle" for lack of the correct term, and darned if it did'nt work. Probably a temp fix as stated but at least problem #1 of 200 is answered. A rebuilt or new throttle body is now on the "list".
At least I can back the car into the garage with out worrying about smashing the washer and drier into my daughters room.
Now for the tranny, hubs, UJ's, etc..........................
You guys are good. Sprayed some lube inside the throttle body right at the "butterfly axle" for lack of the correct term, and darned if it did'nt work. Probably a temp fix as stated but at least problem #1 of 200 is answered. A rebuilt or new throttle body is now on the "list".
At least I can back the car into the garage with out worrying about smashing the washer and drier into my daughters room.
Now for the tranny, hubs, UJ's, etc..........................