Car runs fine for the first 5 to 10 minutes then like clockwork the CEL comes on and the car stutters and wants to die sometimes at a stoplight... acceleration is fine but at steady cruising speeds its studders sometimes..
only when warmed up though..
here are the codes I pulled:
81 o air divertor solenoid fault/intake air control circuit fault
82 o air divertor solenoid circuit fault
34 c insufficient EGR flow or EVP voltage high
41 c HEGO (HO2S) sensor signal out of range/always lean
63 c throttle position circuit fault/below minimum voltage
66 c VAF/MAF sensor fault - below minimum voltage
91 c HEGO (HO2S) sensor signal out of range/always lean
anyone think they can tell me where to start?
erik, my car had almost the same problem and I fixed it last week
. Let me tell you a little more about my car's problem: it wasn't limited to only warm engine problems. It did it even when it was cold. The codes that I pulled were 34, 41, 91 (which I've had for the last yr and a half) and finally code 63.
When I tested the TPS, it was giving funky voltages.....like 0. I probed the power wire from the EEC and it showed 5V so I knew it was getting good voltage but it's output voltage back to the EEC was bad.
I bought a new, USA made TPS from Advance Auto parts on New Year's Day and installed it. I also reinstalled the original, Ford TFI back onto my distributor. I had replaced it last summer when I had another problem. I was suspecting that it was causing my recent problems so I decided to go back to the Ford TFI.
Anyway, the problem is completely gone. Throttle response is so much smoother with the new TPS. I haven't seen the CEL since last year! I'm sure it was/is the new TPS that fixed the problem so, since you've got the code, check your TPS carefully. Good luck.
'91 GT, Hedman X-pipe, Dynomax Ultra Flo Welded, Flowmaster tailpipes, FMS clutch, UPR quadrant & firewall adjuster
'02 WS-6 Trans Am
'80 Z28, 406SBC, World Sportsman heads, Comp Cam, Speed Pro forged pistons, Weiand Team G, MSD Digital 6, Hedman headers, Richmond Gear 6-sp, 3" exhaust, PST polygraphite front suspension, Moog coils, Edelbrock IAS shocks