Sounds like the torque converter is coming out of lockup. Your engine is a little different from the 2010. I'm having a bit of a problem and I am hoping someone could point me in the right direction. I am not going to lie, I would have thought the PWM would be smoother and the fact that I am noticing it now seems odd. Engine Misfire While Moving . After 2 or 3 times of that it will start surging until it reaches operating temp. The engines RPMs seem to bounce back and forth 50-100 rpm. Hey guys, my 2010 5.3 AFM Silverado w/66,000miles has been RPM surging while driving over the past couple weeks. The MAF (mass air flow) systems used on many cars measure the amount of air flowing through the engine's throttle valve (throttle body) and use that information to determine how much fuel to inject. Check the IAC and see if it’s working. then sometimes it will suddenly just shut off as if I turned the key off. The truck starts and sounds fine at idle fine. Cleaned throttle body...now engine surges, 4.3 Vortec died while driving, will not restart. ... My 02 trailblazer jumps in rpm's while driving, typically when i am in crusie control over 55 mph. Up then down, up then down. The problem is surging and drop-off in RPM while driving. 07-24-10 09:50 AM - Post# 1950120 Hi everyone! It also surges and slows down on its own with the pedal in a fixed position. Acceleration Surge While Driving or with Starting: Pull over to … The RPM's will jump up and down 200-300 rpm's only while driving, sitting idle it seems smooth. The surging stops if I let up off the gas pedal right away while driving. Truck surges while driving. Applying the brake makes it go away - When driving either on a flat road or uphill typically, my 1996 K1500 V8 305CI surges a ... SilveradoSierra.com - Chevy Truck Forum | Silverado Sierra GMC Truck Forums The only site focused on Silverado/Sierra trucks exclusively. The check engine light is also on. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. I could floor it and no problem but trying to keep a steady speed the truck would serge. Also, confirm that the problem is not with the catalytic converter. If the engine runs … the 4L60E so that it has incredibly lame shifts. SOURCE: 2002 Chevy Trailblazer surges on the highway. I just bought a 05 Canyon crew cab 3.5 with 204k miles and while driving back from where I bought it I noticed a quirk. It only does it when initially driven that day. RMURDOCK, I think what you are experiencing is completely normal. Truck would die at idle, city driving or at 80 mph. We're not talking about a knocking engine or one that idles rough or stalls.We're talking about engines that start easily and accelerate smoothly, but then, after a few minutes at a steady speed, either surge in speed or misfire, causing the car to "buck." While the REP light was on, I wasn’t able to pull any codes because I was just trying to get the truck home. NO reason to have the truck shift to V4 for a very short distance. I have changed out the speed sensor, the throttle positioning sensor, fuel filter, mass air flow sensor, ran injector cleaner through it. When an engine's computer can "hunt" or "surge" at cruising or idle speeds it is searching for program compliance, there is a problem elsewhere in the system. Hello! Mine did the same thing. Average repair cost is $3,000 at 12,250 miles. when accelerating or a constant speed it continues to do this. I'm stuck and don't know who to believe. roonie. It does this every time when going up a hill, and usually when not,and it is always the same amount that it surges by. Thank God for this truck. Support American Manufacturing and Workers: 50-100 rpm fluctuation - Hey guys, my 2010 5.3 AFM Silverado w/66,000miles has been RPM surging while driving over the past couple weeks. Hey guys, my 2010 5.3 AFM Silverado w/66,000miles has been RPM surging while driving over the past couple weeks. While driving it, the engine surges as if I'm spiking the gas pedal, especially when I'm slowing down to a stop. When driving either on a flat road or uphill typically, my 1996 K1500 V8 305CI surges a bit. I turned in the vehicle for service on Dec 19, 2016, dealer service rep confirm there was an issue and keep the truck for repairs. (Page 1 of 3) The car has started surging or loping, while driving , and does it constantly, and has progressed over the past month. I've had one guy tell me it's the Torque Converter Clutch Lockup Solenoid and another mechanic tell me that is definitely not it. All of this happens after I’ve been driving and not at the initial start up. It idles up/down, surges, and starts sounding like it’s missing, just before shutting down. It will jump from about 1500 RPMs to 1700 RPMs. We have a 1988 GMC Sierra 2500 with a 5.7/350 and auto Tranny. by alkaspeltzar [OP] » Jul 16 2013, 4:21am, by alkaspeltzar [OP] » Jul 16 2013, 8:54pm, by GM Customer Service » Jul 17 2013, 5:07pm, by alkaspeltzar [OP] » Oct 02 2014, 3:08pm, by GM Customer Service » Oct 02 2014, 8:12pm, engine same make thanks still think surging driving rpms back help silverado, Users browsing this forum: Stranger and 40 guests. It seems to happen primarily when traveling between 45-55mph. A technician with a highend scan tool should take it for a road test to diagnose the condition. I got a 1997 7.3 while apllying light pressure on throttle ad while driving a steady throttle truck acts as if im hitting the pedal hard then letting off repetively. I keep mine in 5th in city driving. The 2002 Chevrolet Cavalier has 4 problems reported for engine surges while driving. Any help would be great. It seems to happen primarily when traveling ... SilveradoSierra.com - Chevy Truck Forum | Silverado Sierra GMC Truck Forums The only site focused on Silverado/Sierra trucks exclusively. Truck surges while driving. Put a scan tool (not a code reader) on it and check all the sensors. That's what the dealer said. When driving either on a flat road or uphill typically, my 1996 K1500 V8 305CI surges a bit. 1991 gmc 5.7 surging while driving Sierra Car Forums Automotive ... 1991 gmc 5.7 surging while driving. Code indicated crank positioning sensor. The converter never really locks up like you would think. Never threw a service engine light or a code and would readily re start. I have a 2014, did the same bobble.....Please see the post below, as I and others have seen similar things around 40-50mph when the TCC seems to partially release to increase torque as 6th is alttle deep for gear.
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