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  1. 9

    Map Sensor Code Dying at Idle

    Truck has been running fairly well. Always had a bit of miss at idle that I've exhausted all resources diagnosing. Now it's started to die at idle and it throwing a code 33. The scanner shows the sensor seems to be working. The scanner shows in park at idle the map pressure is around 40KPA...
  2. 9

    I deleted the broken ABS module

    Since the ABS was broke and couldn't be bled on my 95 I took it out. NO ABS is better than NO BRAKES. I used a proportioning valve made for disc/drum brakes in place of it. The brakes behave a lot better in a panic braking scenario. The 10" drums are probably a weak point but I'm happy with...
  3. 9

    Bleed Broken ABS Module

    Can the Kelsey Hayes ABS module be bled on a 95 truck if the pump is stuck? I know about the little port on the side.
  4. 9

    Fast Braking seems sluggish

    Fast braking in my 95 Tahoe seems sluggish. Brakes always felt fine when braking normally except a lot of pedal travel. I replaced the master cylinder and brake booster last year due to them both being bad. This weekend I replaced drums, shoes, wheel cylinders, rotors, and pads. Rear brakes...
  5. 9

    Has anyone used a Holley 2 Barrel on TBI adapter plate

    Has Anyone ever put a Holley 2 barrel on a TBI adapter plate. I understand most everything involved with getting the transmission to shift and other problems. I know some will say this is a dumb idea but I'm contemplating it. I have been chasing my tail with electrical problems for a while.
  6. 9

    ECM does not see reference pulse consistently.

    I've been fighting this random miss for a while on a 95 TBI engine. I think I'm finally on the right track. The reference pulse is not happening or not making it to the ECM. I finally was able to plot the data. Note that the engine RPM's is on the right scale and everything else is on the...
  7. 9

    Timing randomly drops 4-8 degrees

    What will cause the timing to randomly drop 4-6 degrees at idle? The distributor is new and I disconnected the knock sensor for a moment to see if it was related. It still did it. I plugged in a vac gauge and was watching it. I was only seeing .25-.5 inhg fluctuation. Not much. It's a 95...
  8. 9

    How does electronic timing advance work on a TBI distributor?

    How does the computer timing advance work on a TBI? I understand how the vacuum advance works on the old HEI distributors. For the life of me I do not understand how the electronic advance works on the TBI distributors. The rotor is on the shaft and points to fixed pickup on the cap. I do not...
  9. 9

    I've been fighting a rough idle for a while

    I've been fighting a rough idle for a while. It was really acting up this evening. Wen I got home I decided to log the data and see if I could see anything. I Notice at one point I have a spike in engine RPM's that didn't really happen. Maybe something is up with the signals the ECU is...
  10. 9

    Cheap Distributor Problems

    I've been chasing a miss forever. It was there before I rebuilt the engine and there after. It only does it at idle. It only acts up in gear with my foot on the break. The reluctor was cracked on the old distributor so I bought a whole distributor from rock auto. I still have the miss. The...
  11. 9

    Engine Missing While Cold

    I have a 95 Tahoe with a TBI 350. I rebuilt this engine earlier this year due to pitted cylinders. Since, the rebuild I haven't been able to get it to run quite right. It runs fairly well once warmed up. However, on cold start it idles terribly. During the rebuild I used an RV cam, which was...
  12. 9

    Help Diagnosing EGR on a 95 TBI

    The EGR solenoid is allowing vacuum to pass at idle conditions. I assumed the solenoid was bad. I replaced it and it is still doing it. After the problem persisted I hooked a scanner to it. It looks like the the ECM may be requesting it to open at idle when the engine is cold. Once it warms...
  13. 9

    Variable orifice tube vs fixed.

    I will be pulling down the AC system sometime in the near future due to a leak. The AC has never been what I consider great in this truck in 100 degree weather with 100% humidity. Highway speeds vent temps will hover about 48 and in traffic climb to 60. One downside is the serpentine...
  14. 9

    TBI 350 Running Rich

    I am at my wits end. My 95 with the TBI 350 is running rich. It was running rich before the rebuild and is still running rich. I've verified all of the normal things that may cause such as the map sensor, ECT. I haven't checked fuel pressure. The problem seems to only be affecting one side...
  15. 9

    overheating at idle

    I recently rebuilt my 95 Tahoe with a 350 TBI due to knocking. I've had it back together for a couple of months now. Since the weather has warmed up it has started running a bit warm at idle. If I rev the engine to 2000 rpm the temp comes back down. Temp gauge is bumping 225, not sure how...
  16. 9

    Hot spot between cylinder 6 and 8

    I just got the rebuilt engine in my 95 Tahoe up and running. I had put in a secondary temperature sensor in the passenger head because my factory gauge always read low. Is there a fix for the low reading? The back temperature sensor will hit 250 before the thermostat opens at 180F. My scan...
  17. 9

    Starter noise on new flex plate

    I just finished rebuilding my the 350 that goes in my 95 Tahoe. I went with a new flexplate on this rebuild and now the starter is noisy. Initially it felt too tight I could hear the tight spot while cranking. I did not remove the dust cover to see what was going on due to all the stuff that...

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