3 until I figured out about the cheap wires. Chevy C/K Truck Forum. I thought maybe my plug wires are in the wrong spots on the cap so I moved them all over one but then the engine cranks and stops, then cranks and stops.
Started back up, soon as It dropped in gear, it died again, starts right back up, have to pump the accelerator constantly once in gear to get it home, could not go over 25mph or into high gear, it would die. An engine backfire occurs whenever the air-fuel mixture in your car combusts somewhere outside the engine's cylinders. Sounds like the timing is retarded. 4.3L miss and backfire under load. Timing has not been touched, distributor has not been removed. I removed the plenum to find all the poppets still firmly in place.
I also have the chevrolet chassis manual that came with it. I almost cant hear it when listening next to fuel tank. You could have a pick up coil in the distributor going bad, or the magnet could be cracked. This followup was posted to and a c> 1993 4. Here is what I've done so far just recently with in the past week I put a MSD cap rotor and coil on the truck trying to fix the misfire issue was told that the original caps were made out of a different material and MSD cap would be silverado 5. Backfiring with flame through throttle body. Any advice is welcome. I have the ALDL port wired up and I will try to put the tech 2 on it tomorrow... any ideas? Under a load or going up a hill same thing, run bad, good, bad, good and stay that way for a while. Glad you found the problem. PENGZHOU LS Conversion Engine Mounts 1973-1987 Square Body- Universal Swap Bracket Small Block Adjustable for LS1 Swap 88-98 GM Truck RAW 1500 2WD. I tested the MAP sensor with a vacuum pump and it does eventually leak down, but very slowly -- from 25 in.
What should I check now? How bad was the rotor button when you replaced it? Here's a close up of the distributor, someone has marked it in the past. I put the old ICM back in, cleaned and greased all electrical contacts, took the intake elbow off and sprayed starting fluid in there and tried to start it. If fuel pump does not run, go to step 7). We would spray starting fluid in the intake. Here's something weird about the timing that I discovered: in normal operation (tan wire connected, no trouble codes, engine warmed up), it idles about 12 BTDC, advances to around 20 at 2000 RPM, but when I let off the throttle, it drops to zero while the engine spins down, then goes back up to 12. I then removed the upper plenum on the intake manifold to take a look inside to ensure the "spider" injection unit or fuel lines were not leaking. Are u Sure you the ignition firing order correct? 4.3 tbi backfire through intake heads. Found the CTS to be bad. 5L start its backfiring through TBI New EGR valve replaced the head gasket and now it wont start just backfires through the throttle body? I replaced the fuel pump-because it was bad in July. Just clean up the intake of fuel, replace the regulator, button it all back up and it should run like normal again............ not the case. Location: All over China, Iowa, and San Luis Obispo, CA.
Then put a compression tester and see if there is, Check a couple and see if they are consistent. I'm going to start with doing another full tune up here soon (plugs, wires, cap, rotor button, air filter, fuel filter). January 12th, 2010 9:36 PM. Sputter and backfire during acceleration. 5:1 compression and uses HEI. I had heard fuel spider could be the problem. Spin over first and then check plug to see if any gas is on it. The engine starts and runs fine, when I leave for or from work. Engineering & Technology. Fuel psi is good, pump and filter are new.
Just for giggles, Hold the accelerator past 70% or just all the way to the floor, and then try to start it. Advancing it to the range of 4-8 deg. Other than that the harness went right on the engine no problems. 4.3 tbi specs. If the timing chain went it would sound too easy turning over. I have a 1990 GMC TBI 454. MAP code 34 low voltage. It has 313, 000 miles on it and the engine is completely original. 00 for diagnoses from the dealership but they were right on time.
It idled high, but after I plugged the brake booster vacuum line it idled right down very smoothly. New fuel/air filters. Ive got a 95 s10, 4. Two of the three things you need. Stalled at a traffic light, thought I was out of gas, but was not. 1988 CHEVROLET TRUCK. In mine it got to where when hot it would start back firing intake and exhaust and then shut down till it cooled off an hour or so, then run fine till hot. Mine was counting knocks and killing the timing so it had no uphill power at all;An exhaust tail pipe backfire is caused by an excessive amount of un-burnt fuel remaining in the exhaust system or fresh air being allowed to enter the system which ignites a small amount of …MEMBER. 4.3 tbi backfire through intake per day. Temp guage - 210 - 220 deg. Pump should run 2 seconds (20 seconds on models with fuel module).