1997 Chevy Truck 97 C1500 bogging BAD.

HAWGHUNTER

MEMBER
1997 CHEVROLET TRUCK
V8
2WD
AUTOMATIC
189,000 MILES

So, a few months back I did a major tune up on my truck.97 C1500 with the 5.7 Vor. Had her purring like a kitten. Well, just the other day I was headed to the store when it suddenly back fired a few times as it died in the road. Got it pushed back to the house and started tinkering looking for obvious signs. When that didnt turn up anything I went straight to fire. Pulled the cap and lo and behold the rotor had flew off. Evidently in my haste to get the truck back together during the overhaul I didnt tighten the screws well enough. So, Since to rotor was damaged I bought and installed a new one. The truck fired right up and idles great. She'll even have a little pep to her when I first take off. But thats where it stops. Any attempt to accel is met with some horrible bogging. Accompanied with a back fire every now and again.

I have.

checked the cap
checked the distributor
checked the ignition coil
checked the timing chain
checked the spark plugs and wires

Its driving me crazy! Did a search of the forums and nothing. Any ideas? Any help would be greatly appretiated. Hawg

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Check and test the following:

Oxygen sensor
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
Cap and rotor