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  1. Fredje

    1997 k1500 Chevrolet Suburban shaking/shuddering/jerking at highway speeds

    So I went to the repair shop that has a lot of GM transmissions under repair and the owner did a 20min test drive together with me. He strongly suspects the converter lockup clutch. He will also check the solenoids/valves but the way it feels he said he was sure it was the clutch itself. It...
  2. Fredje

    1997 k1500 Chevrolet Suburban shaking/shuddering/jerking at highway speeds

    Tomorrow I'm going to call a repair shop who might have this sort of bi-directional scan tool. However I do not have any fault codes, is this strange? If the jerking would be caused by slippage, why would the P1870 not be flagged? Or: if there is no P1870, there is no slippage? And now I'm...
  3. Fredje

    1997 k1500 Chevrolet Suburban shaking/shuddering/jerking at highway speeds

    Ok thanks a lot! What bi-directional scan tool could I buy that is cost effective? I use a scan tool linked to my phone but did not see any codes or tcc related info. Thanks!
  4. Fredje

    1997 k1500 Chevrolet Suburban shaking/shuddering/jerking at highway speeds

    Yes, disengaging the TC lockup through lightly touching the brake pedal solves the issue (when it is not in TC lockup).
  5. Fredje

    1997 k1500 Chevrolet Suburban shaking/shuddering/jerking at highway speeds

    Hello fellow enthousiasts, recently my Suburban developed a jerking / shuddering when in lockup. I suspect the TC lockup, and after some research on the forums I indeed suspect the TC. The car has a little more than 130k miles. No codes are thrown. Anything I could check myself? Any connectors /...
  6. Fredje

    1997 Chevy Suburb 5.7 K1500 rough idle

    Update: last weekend I ordered a new injector rail (4 injectors), wet and dry gas filters and went ahead today. Apart from some freightening moments (remaining gas escaping when loosening the tubing and filters) I managed to replace the defective items. All went well, no leaks after assembly...
  7. Fredje

    1997 Chevy Suburb 5.7 K1500 rough idle

    Thanks for the clarification on the cylinder numbers. That would mean I was talking about cylinder number 7. We recently replaced the entire distributor so my first guess is that wouldn't be the issue, but you're right and I will dig deeper into the issue this weekend questioning the LPG system...
  8. Fredje

    1997 Chevy Suburb 5.7 K1500 rough idle

    Dear enthousiast, many thanks for the elaborate reply. I love this car, but with a forum like this I might love it even more! To answer your questions, and to give an update to my findings some extra details: - it did not throw a code - yet - Since it does not do it on gasoline, but it does on...
  9. Fredje

    1997 Chevy Suburb 5.7 K1500 rough idle

    Hello, I have an issue with my 1997 Chevy Suburban with 5.7 Vortec and dual fuel conversion, 215k kilometers: it developed a consistent rough idle since a few days that started when driving in very rainy weather, but it does only do this when running on LPG, not on gasoline. On gasoline it runs...

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