Why does my Chevy TBI idle so high?
Why does my Chevy TBI idle so high?
Here’s a list of troubleshooting items for a high idle: I’m surprised they didn’t include “vacuum leak” as a possible cause. That’s essentially what mine ended up being, except it wasn’t located at a vacuum tube or port. I found my solution here: [SOLVED] extream high idle problem on 1990 chevy 1500, 4.3 v6 TBI, with this post:
What causes a 1994 Chevy C / K 1500 to bog down?
– CarGurus 1994 Chevy C1500 5.7 bogs/backfires when I give it gas. My truck bogs down (and tries to die) when I give it gas to accelerate off of a stop. There is often a backfire or two when this happens. Pumping the gas does not help. I basically have to crawl through any intersection until it picks up a bit of speed from idle. The truck
What should the idle speed be on a TBI 350?
The IAC should NEVER get closed all the way, which would be an IAC count of zero. When everything is at its optimum, cleaned and working correctly, the idle count will be around 15-20. The IAC controls the idle speed ALL the time not only on a cold start up. Loc: Twin Cities, Minnesota, U…
Where is bowtie badboy’s Chevy TBI 350 located?
Loc: Twin Cities, Minnesota, U… As for Bowtie-badboy’s problem, if he rebuilt the TBI unit and soaked the IAC in carburetor cleaner, or sprayed carb cleaner on it while holding the plunger pointing up, the IAC is most likely damaged from the cleaning. The IAC controls the idle speed ALL the time not only on a cold start up.
What should the idle speed be on a GM TBI?
Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM. Turn off the engine and disconnect the negative battery terminal from the battery using a wrench.
– CarGurus 1994 Chevy C1500 5.7 bogs/backfires when I give it gas. My truck bogs down (and tries to die) when I give it gas to accelerate off of a stop. There is often a backfire or two when this happens. Pumping the gas does not help. I basically have to crawl through any intersection until it picks up a bit of speed from idle. The truck
Loc: Twin Cities, Minnesota, U… As for Bowtie-badboy’s problem, if he rebuilt the TBI unit and soaked the IAC in carburetor cleaner, or sprayed carb cleaner on it while holding the plunger pointing up, the IAC is most likely damaged from the cleaning. The IAC controls the idle speed ALL the time not only on a cold start up.
Can a Chevy C / K 1500 run at idle?
There is often a backfire or two when this happens. Pumping the gas does not help. I basically have to crawl through any intersection until it picks up a bit of speed from idle. The truck idles smoothly, and it runs fine once it’s above about 5-10mph or so. If moving at a picking up the speed.
What kind of engine does a Chevy c1500 project have?
If you’ve been to this site before, you might be familiar with my 1991 Chevrolet C1500 project truck. Long story short, I needed to swap the V6 in the truck for another engine (it had a rod knock).
What’s the idle speed on a GM Truck?
I recently got to the point of starting the new engine up, and it would idle at 2,000 RPM for 30 seconds or so and then drop to 1200 RPM. Both of these speeds are too high for idle.
Where is the vacuum tube on a TBI truck?
That’s essentially what mine ended up being, except it wasn’t located at a vacuum tube or port. I found my solution here: [SOLVED] extream high idle problem on 1990 chevy 1500, 4.3 v6 TBI, with this post: Two things come to mind very quickly. 1.
Here’s a list of troubleshooting items for a high idle: I’m surprised they didn’t include “vacuum leak” as a possible cause. That’s essentially what mine ended up being, except it wasn’t located at a vacuum tube or port. I found my solution here: [SOLVED] extream high idle problem on 1990 chevy 1500, 4.3 v6 TBI, with this post:
If you’ve been to this site before, you might be familiar with my 1991 Chevrolet C1500 project truck. Long story short, I needed to swap the V6 in the truck for another engine (it had a rod knock).
Can you change the throttle body on a 350 TBI?
Modify the throttle body. This one pretty cheap but does require removing the throttle body. UTIMATE MODS . Stock 42mm TBI units flow around 450cfm which if you look at http://www.carburetion.com/calc.asp a stock 350 even with a cam upgrade to increase the powerband to 5500 rpms isn’t going to use much if any more than that stock throttle body.
That’s essentially what mine ended up being, except it wasn’t located at a vacuum tube or port. I found my solution here: [SOLVED] extream high idle problem on 1990 chevy 1500, 4.3 v6 TBI, with this post: Two things come to mind very quickly. 1.
How to reset the idle speed in a GM TBI?
Unplug the IAC valve located on the passenger side, rear of the throttle body. Start the engine. Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM.
I recently got to the point of starting the new engine up, and it would idle at 2,000 RPM for 30 seconds or so and then drop to 1200 RPM. Both of these speeds are too high for idle.
What makes a 91 Chevy surging at idle?
My father in law’s ’91 Chevy was running poorly, so we put new plugs, wires, cap and rotor on it, and it’s running better, but it it still surging at idle. It basically almost dies out, and then surges back to life (probably a little higher than normal idle), then repeats continuously until you apply some throttle.
What is the TBI code on a 1990 Chevy truck?
Consult a service manual or see below for any check engine light code definitions. You can use a late 80’s or early 90’s GM TBI definition. If you have access to a scan tool use a hook up for a 1990 350 cu. in. 5.7L Chevrolet truck. For some scan tools enter VIN 10th“L” 3rd“C” 8th“K”.
