PO 34 7 88, at my wits end

[cozz]

CE light came on, checked codes, got 34, and 88. So far I replaced EGR, EGR control solenoid, and the little sensor that rides on the back of the EGR, for the code 34, still throwing that code. For the 88 (dual spark) I replaced the crankshaft sensor, and the ICM, and put new wires on - still getting that code. What am I missing? It's a 1990 with a 2.3, and is running generally like crap, especially after it warms up

 

[tomw]

Throttle Kicker Solenoid - Solenoids
Variable Voltage Choke relay circuit fault - VVC
Fan Control circuit fault - A/C and Fan Circuits
A4LD - Converter Clutch Override solenoid - Transmissions
I don't think the other possibles apply.

88 Electronic Ignition - IDM, DPI or spout circuit fault - Ignition Systems

I would check the wires for loose connections.

34 EVP - (R) EGR did not respond properly during test - EVP
EVR - (O, R, M) EVP sensor is/was high - EVR
PFE - (O, R, M) PFE sensor is/was out of range - PFE

The "R" is running ... did you do the KOER test? Somewhere in the midst, you have to stomp on the throttle, wiggle the steering wheel back and forth, and something else I forget. The computer will try to apply vacuum to the EGR. If the vacuum lines are chafed or have a leak, it won't apply. It can also affect the running of the engine. Dunno what PFE is, but newer models have a DPFE which monitors back pressure and diddles the EGR to match. I think.
Some of the replacement EGR sensors had a shaft that was a few thousandths too long, and didn't allow the EGR to close all the way, or maybe open all the way.
I would manually move the EGR sensor or diaphragm to see if I could influence the code. I'd also apply vacuum to the diaphragm to see if it was intact, or was it replaced... not clear.
tom

 

[cozz]

thanks

for your input, just did a engine running test, and it told me nothing was wrong, lol- cleared codes with my code checker, drove it for it for a while , still getting low end lag, and missing, think I'm gonna look at the tps

 

[tomw]

If you have hesitation, try cleaning the MAF. If you have adjustable timing, a gutless wonder could be caused mistimed ignition.
tom