1996 Chevy Blazer

TBSBLAZER

MEMBER
1996 CHEVROLET BLAZER
6 CYL
4WD
AUTOMATIC
157,000 MILES

Hi I have a 96 blazer that surges from a takeoff. It only does this while the engine is warming up. Once the engine is warm the problem seems to go away. It seems to only do it through 1st and 2nd gear also. I have changed the maf sensor, the plugs, wires, cap, rotor, fuel filter, and coil. None of these things have made any differance in the way it runs. Could this problem be o2 sensors or the ignition control module or even possibly the egr valve? It throws codes like p0300, p0440, p0758, p0700 pending, and p1192 pending. I am at a loss so any advice would be appreciated. I erased all the codes before I put the new parts on and now I don't get the p0758, or the p0440. What should I do?

1 Reply

PEAR69

MECHANIC
1,482 POSTS

The p0300 code is a general mis-fire. This can lead to the other codes. The p0700 and the p0758 are isues with the transmission shifting components. The p0440 is probably a bad gass cap or it was put on wrong at some point.

The engine must be running properly for the transmission to shift at the right time. The general mis-fire could be a number of things. The distributer gear is a commonly overlooked problem with these engines. They tend to wear to the point of causing a mis-fire. The engine should be checked for proper timing. You cannot check the timing without using a scan tool that is capible of doing this. A timing light will not work because the computer controles the spark advance.