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  1. 89_C3500_Larry

    External fuel pump runs with key in accessory position.

    I have a carburated 454 in a 1989 c3500 that originally had a 350tbi. The external fuel pump runs with the key in accessory position. Where should I hook the power so that it only runs with the key in the run position? Any wiring advice?
  2. 89_C3500_Larry

    What have you towed lately

    I tow this 10k camper on the regular with my 89 1 ton.
  3. 89_C3500_Larry

    Th400 transmission cooler for towing

    I'm sure, the lines come out of the transmission and go straight to the radiator. That's the only cooler on the system
  4. 89_C3500_Larry

    Th400 transmission cooler for towing

    Gen V
  5. 89_C3500_Larry

    Th400 transmission cooler for towing

    Correction #### 1988 C3500,. Not 98
  6. 89_C3500_Larry

    Th400 transmission cooler for towing

    It has the large 4 row radiator with the transmission lines going thru it. Belt driven fan. My theory is. After Travel about 75 miles at 55mph on country roads, with intersections every 10iles or so. I get to my site, and there are some trees, and it taking time to get situated, my coolwnt...
  7. 89_C3500_Larry

    Th400 transmission cooler for towing

    I have a 1998 c3500, motor swapped from a 350 tbi to a 454 with a demon 600. It's got a th400 with a 4.10 rear gear. The radiator has a built-in transmission cooler. Would it benefit me to add a fan driven external transmission cooler? I'm consistently towing 11,000 fully loaded and my...
  8. 89_C3500_Larry

    Truck sputters and backfires when hot

    I checked the icm, it had a small amount of "thermal paste" on it, and it was a "transpo" brand (cheapest Chinese crap on Earth) I found them for less than 10 bucks on alibaba, anyway I decided to put in an AC Delco with a generous amount of thermal compound from best buy, and I can say it made...
  9. 89_C3500_Larry

    Truck sputters and backfires when hot

    Great to hear it was The only sensor I have replaced was the temp sensor and it needed to be replaced because its wire terminal was broken. I did replace the fuel filter, forgot to mention that. Thanks for the info. I'm at work now, but this weekend I'll look into that icm.
  10. 89_C3500_Larry

    Truck sputters and backfires when hot

    I have had it hooked up to a scanner, directly to the ecm, and the only out of spec reading was the throttle position sensor, and we adjusted that. It fixed the high idle. Also the O2 sensor reading rich/lean. Also checked the fuel pressure, and maintained 10psi, I thought this was low, but was...
  11. 89_C3500_Larry

    Truck sputters and backfires when hot

    All of the parts I listed were part of the engine overhaul, I wasn't throwing those parts at this issue, most of the parts were 30 year old original, and needed to be replaced anyway.
  12. 89_C3500_Larry

    Truck sputters and backfires when hot

    Have you figured out what the cause of your problem? I am currently experiencing a similar issue with my 1990 7.4 tbi. seems to only misfire, bog, choke, sputter, and lack power after running for more than 10 minutes, and seems to be worse when its hot outside, and also only seems to do it in...
  13. 89_C3500_Larry

    1989 c3500 extended cab lift.

    I've found several lift kits for an 89 c3500, but they all claim not to fit an extended cab truck, why is this? And anyone know of a modest lift kit for the 1989 c3500 dually?
  14. 89_C3500_Larry

    1989 c3500 proportioning Valve.

    Thanks
  15. 89_C3500_Larry

    1989 c3500 proportioning Valve.

    I need to replace my pv and I'm wondering if this one will work. I'm also seeking any advice on installing said pv and general info on improving brake function as I plan on towing a fifth wheel camper. ACDelco 172-2069 GM Original Equipment Brake Combination Valve...

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