Engine surges
#1
Engine surges
I have an 06 H3 with 230k miles on the odometer but engine replace at 160k and trans replace at 220k. The engine surges when accelerating but only when A/C is on. It settles down when it gets to cruising speed in 4th. Any thoughts?
#2
The pcm increases rpms when the ac compressor kicks in. Same when you're driving with cruise control set and enter an incline, the rpms will increase.
#4
"Stumble"
What is engine stumble?
Hesitation is when your engine misfires, stumbles or lacks power when you accelerate or step on the throttle. The problem often means the air/fuel mixture is not being properly enriched or is going lean, or the ignition system is weak and is misfiring when the engine comes under load or the air/fuel mixture goes lean.
#5
Easy/cheap stuff first: Using a quality scanner, check for active/history codes. Check/replace air filter, check/clean maf sensor, check/clean tb, ONLY use top tier gas.
#6
TB cleaning should be done about every 30K miles, more often in dirty dusty conditions. Basic modern vehicle maintenance.
#7
Thanks Doc. Your reply is very helpful. I hesitate to use forums like this because you get a different answer from every reply and it tends to confuse the issue. Don’t get me wrong, I think this forum is helpful…if you love to tinker with your Hummer and have a sound basis in vehicle mechanics. I’m not one of those people. To be honest, I hate working on vehicles.
Thank You again.
Thank You again.