Changed Maf senor, crankshaft, fuses, spark plugs. fuel filter and ignition modulator and the car starts but only runs about five mins. before stalling. No engine light comes on. No bad codes show up. Can't find any bad hoses. My mechanic teacher has looked and we can't figure it out. I am a student and can't afford to fix much more and nothing I have spent money on has worked so far. When I first put the maf in the car worked great for about a week but the transmission was still skipping

10

Asked by ezpit Apr 10, 2015 at 09:47 AM about the 2002 Buick LeSabre Custom Sedan FWD

Question type: Maintenance & Repair

Changed Maf sensor, crankshaft, fuses spark plug fuel filter and ignition modulator. Checked hoses. No engine light comes on no bad codes show up.  After replacing maf the car worked great for a week but still skipped in the transmission..  NOw it starts and runs five min. before stalling.  Sounds great for the five mins.  My mechanic teacher has looked over and we are stumped.

2 Answers

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Nothing showed up when we did the scan tool. Does it matter what brand senors you buy? Are there certain things that can go wrong that don't show up on the scan tool?

1 people found this helpful.

Recheck your fuel pressure while running before and after that 5 minute mark. I suspect your fuel pressure regulator or in-line fuel filter is the problem. If it is idling the whole time, check how clean the idle air valve is (mine was very dirty at 80K miles on my 2004 LeSabre...

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