My truck has been studdering or bogging down at high rpms. this ONLY happens when the truck is at running temperature. in the mornings when the truck is first cranked it runs perfectly. once it hits temperature it will bog down and make a studdering noise with no acceleration right when its ready to shift, and into the next gear before clearing itself out. i also do not get as much power as i used to... it used to cut off at 92, now im lucky to ever hit 60. not throwing any engine lights... I have replaced the following: ignition coils ignition coil module plugs and wires fuel filter o2 sensors coolant temperature control sensor computer truck has been in three dif. shops, to no avail. i have been working on this problem over a year. please help!!
Without testing while the problem is happening we would only be guessing . Hooking up a professionl type scan tool and viewing engine and transmission sensor data when the problem is happening is the way to find a fix . Replacing the parts you did - ignition coils , ignition coil module , plugs and wires , fuel filter , o2 sensors , coolant temperature control sensor , computer . I think your going in the wrong direction , i would be looking at transmission input shaft an output speed sensors . Or maybe a shift solenoid problem . But these would only be guesses . I suggest you find a good diagnostician that has the proper diagnostic tools an let have the vehicle for awhile to drive it with his diagnostic tool hook up .
Sound's like it break down due to no oil or water circulate
the engine. Or wrong spark plug gap. So it increase too much heat.
-Try this:
1. Flush the engine. Flush the coolant.
2. Check spark plug gap (Adjust to correct gap)
3. Check oil pressure. If it's low then new oil pump is need.
Good Luck
Mai
SOURCE: 92 CHEVY BLAZER K1500 WON'T START
try messing with the radiator because it is most likely overheating
SOURCE: 1998 chvy 1500 loses power
check the intake gaskets. in the middle front and middle rear. If they are oily, it more than likely sucked part of the gasket in. When it warms up the leak gets bigger. The easy way to check is to get some carb cleaner and spray all around the intake while idling and warm. DO NOT SPRAY ANY EXHAUST PARTS , carb cleaner is combustible. The truck should stumble or even shut off when spraying with the carb cleaner if there is a leak.
SOURCE: i have a 1996 S10
I hate to say spend more money but the fuel pressure regulator is what I would do next...but you dont have any codes at all??
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