When does the 1990 c1500 TBI idle go away?

1990 C1500 TBI 5.7L Idle is surging when warm. Unplug the MAP Sensor and the problem goes away, I replaced the MAP 1990 C1500 TBI 5.7L Idle is surging..MAP Sensor..goes away..Autozone… 1990 C1500 TBI 5.7L Idle… 1990 C1500 TBI 5.7L Idle is surging when warm.

What should the EGR be on a 1990 c1500 TBI?

Check the EGR for being partially open (this may require removal to look at pintle) With engine running look at fuel integrator & block learn (fuel trim) they should be close to 128.If they are higher the computer is adding fuel.When the engine is warmed up the 0/2 should be bouncing back & forth over .500 mv.

What should BLM be on 1990 c1500 TBI?

With engine running look at fuel integrator & block learn (fuel trim) they should be close to 128.If they are higher the computer is adding fuel.When the engine is warmed up the 0/2 should be bouncing back & forth over .500 mv. My BLM is 135, sorry I forgot to mention i replaced the 02 sensor.

What are the ohms on a 1990 c1500 TBI?

Look very closely at the terminal ,they must make good connection. OK, 170 oms on Pupple wire and 302 ohms on the green wire. If this reading is with the sensor & ECM disconnected you have a high resistance circuit,If not go back disconnect the MAP & ECM so the circuit can be tested.

What kind of engine does a Chevy c1500 have?

Among these, 4.2 L MWM Sprint 6.07T I6 is another variant that is marketed only in Brazil and Argentina. While looking for powerful V8 such as the 1995 Chevrolet c/k 1500 engine 5.7 L V8 and 1992 Chevrolet c/k 1500 engine 5.7 l V8, you may also come across the reliable 90-degree V6 engine.

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.

Why does my LS Gen engine have high idle?

Once replacing that if the problem still persists you might have issues with the throttle body, I seen this before in the ls gen motor, they get “sticky” tb’s causing the high idle problem. Another thing is if you have an aftermarket tb, say from like bbk performance they need adjustments and tuning or else you’ll have similiar problems

What causes high idle on a TBI truck?

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. Leaky throttle body base gasket.Very comon on this engine.I don’t know if you serviced this when you pulled the intake.

What’s the idle speed on a 1990 Chevy?

Not open for further replies. I bought a 1990 Chevy 1500 pickup several months back. it idles around 1500 to 1800 rpm and it is tearing the transmission apart.

What’s the idle RPM on a Silverado Silverado?

Re: high idle PLEASE HELP!!! When i pull the vac line from the booster the idle rpm stays at the 1200 I had been idling for 2 yrs. It only runs rougher but maintains 1200. When I pull the same line from the back side of the intake she revs really high. Enough to scare you so I plugged it back in really fast.

What causes Extream high idle problem on Chevy 1500?

Two things come to mind very quickly. 1. Leaky throttle body base gasket.Very comon on this engine.I don’t know if you serviced this when you pulled the intake. 2.Misadjusted or bent throttle linkage.You don’t know what was done before you got to it.

How does the TBI system work on a car?

TBI being a MAP sensor based system will see the leak just like opening the throttle blades and will feed the leak and then you have a high idle. Finding the leak can be tricky as it can be the intake gasket on the bottom side if you are using a Chinese junk carb intake or you weren’t real careful putting the intake on.

How big is the vacuum gauge on a TBI?

Vacuum gauge. Simple mechanical gauge. Hook it to all ports on that throttle body. When you get to the map port just move map to a different port on the throttle body. Typical TBI motor will idle with 20-21 inches of vacuum stock.