Hi allStill trying to find out why my 1998 chevy pickup,silverado 1500 series runs very bad,can not give it much gas..only does this when ambient temp outside is 68 degrees or lower...70 and above burns the tires off...5.7 vortex engine...does anyone have any idea....temp controls this for sure...


Asked by Apr 24, 2015 at 10:59 PM about the 1998 Chevrolet C/K 1500

Question type: Maintenance & Repair

4 Answers


Have you had the ECM "live data" scanned cold? There could be a sensor sending an improper signal, telling the ECM it is too hot or too cold or the air temp is 300 degrees when it is actually 30. I had a customer that came in with his rig's fuel mileage all of the sudden just dropped almost 5 MPG, checked it over and found that the ECT sensor was reading at -30 cold engine to a + 15 degrees fully warmed up, changed the sensor, reset his computer and his mileage was actually better than it had been but the ECM did not turn on the light cause it was seeing a moving reading so it believed the readings. HTH


will get it scaned..i was trying to figure out what sensor could do that..I have had some many things changed so far...thx so very much for the info ...if you think of any certain sensors i could change,please let me know...thx again,carl


Don't start throwing parts at it hoping you will find the problem, doing the scan is a money and time saver, after all it might not even be a sensor, it could be in the circuits, that is why the test is the most viable at this point.

1 out of 1 people think this is helpful.

ok thx so much again.take care

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