The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Loss of power on acceleration when warm, backfires a lot.

Nodnarb76 · 04-06-2021, 09:03 AM

I have an 87 Suburban with a 6.0 LQ4.
For a while now, when the motor is warmed up, when I go to accelerate sometimes it will bog down and not want to move. When this happens it backfires like crazy, and if I keep the accelerator pedal pressed once the RPMs finally get up the truck will accelerate and get up to speed.
When I did the swap 5 years and 16,000 miles ago I replaced the spark plugs, plug wires, fuel filter, ignition coils, and MAF sensor. I did not replace the fuel injectors. I have a fuel gauge mounted to my fuel rail that shows a constant 58 psi at idle. I do not have any check engine lights or any stored codes.

Any Ideas where to start?

04-06-2021, 09:03 AM	#1
Nodnarb76 Registered User Join Date: May 2013 Location: Mississippi Posts: 501	Loss of power on acceleration when warm, backfires a lot. I have an 87 Suburban with a 6.0 LQ4. For a while now, when the motor is warmed up, when I go to accelerate sometimes it will bog down and not want to move. When this happens it backfires like crazy, and if I keep the accelerator pedal pressed once the RPMs finally get up the truck will accelerate and get up to speed. When I did the swap 5 years and 16,000 miles ago I replaced the spark plugs, plug wires, fuel filter, ignition coils, and MAF sensor. I did not replace the fuel injectors. I have a fuel gauge mounted to my fuel rail that shows a constant 58 psi at idle. I do not have any check engine lights or any stored codes. Any Ideas where to start? __________________ 1987 R20 Suburban LQ4/4L80e swap: http://67-72chevytrucks.com/vboard/s...d.php?t=693824