I changed the egr valve and the dpfe valve and the check engine light is still on. What else could it be. The diagnostic code said that, that was the problem. 98 linc navigator.
2007-01-16 13:12:44 · 13 answers · asked by lady_eli_2 2 in Cars & Transportation ➔ Maintenance & Repairs
Once light has gone on, even after repair, it has to be reset. Mechanic trick is to disconnect the battery at the terminals, wait 30 minutes, then reconnect. Many times that will reset it. If it comes back on after awhile then you just have to take it by the dealer or any diagnostic center to have it computer reset. OR you could just pull the fuse for it.
2007-01-16 13:24:14 · answer #1 · answered by Quest 6 · 0⤊ 0⤋
it doesnt go away until you reset the computer, in a chevy you turn the key on and pump the gas pedal for 3 pumps real fast all the way to the floor then all the way released, do this within a 3 second period, then turn the key all the way off then wait for another 3 seconds then start the vehicle and the light will flash a few times then will go away if it comes back on then the problem isnt fixed, also on some models, you disconnect the battery wait for a few seconds, and then reconnect the terminal, those are a few ways to try good luck, im sure on the chevy a mechanic walked me through it and it did work
2007-01-16 21:21:46 · answer #2 · answered by waterboy 4 · 0⤊ 0⤋
The code needs to be erased with an OBDII code reader..... then if the light comes back on read the codes and see what it is. Disconnecting the battery will not fix anything. When a code is stored in the computer only an OBDII code reader can erase the code. Also stomping the gas pedal does nothing as well.
2007-01-16 21:37:58 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The codes do not tell you exactly what is wrong with the car. It shows you where to look. There could be wiring problems, or the egr ports could be stopped up, it could also be a vacuum problem. There are many possibilities as to what the problem could be. It all depends on the code.
2007-01-16 22:26:58 · answer #4 · answered by PoolhallJunkie9 1 · 0⤊ 0⤋
Were all the passages clear when you replaced the egr parts. Did you clear the codes.They will stay there till you clear them or 35 engine cycles.Disconnect the battery for 1 minute to reset the ECM and erase the codes.Or if you can find the ECM fuse pull it for 1 minute. Good luck hope I helped
GM tech for 20 years
2007-01-16 21:21:23 · answer #5 · answered by Rudedude 4 · 0⤊ 1⤋
More tests have to be done to determine what caused that component to fail. It doesn't mean because you replaced the part that the code represents doesn't mean all is good. It takes a little more work then that. If you haven't erased the code when part was replaced try that and if code comes back you need a little more probing.
2007-01-16 21:22:10 · answer #6 · answered by wheeler 5 · 0⤊ 0⤋
check for a vacume leak to the egr and the dpfe.or hoses collapsed to them,also the tubes running to the dpfe could have carbon in them.
2007-01-16 21:18:06 · answer #7 · answered by strange_busaman 3 · 0⤊ 0⤋
This indicated a fault with either the computer, its input sensors or one of its outputs. Go to your dealer and have the codes read to locate the fault. In this condition you could be using too much fuel and have low performance best get it checked ASAP
2007-01-16 21:23:09 · answer #8 · answered by Anonymous · 0⤊ 0⤋
For one you can bring it back in and get it reset which needs to be done after parts or changed. You may have other codes now. So bring it to autozone let them reset and run the test again.
2007-01-16 21:18:13 · answer #9 · answered by scott29 2 · 0⤊ 0⤋
i would re-scan the truck........it is possible the truck needs to re-calibrate the computer after you fixed the problem, so you may try disconnecting the battery for an hour then re-connect it and see if the problem still persists. it is possible the 'new" part you bought could be faulty, i've seen that before, not often though.
hope i could help
2007-01-16 21:20:42 · answer #10 · answered by hittin' switches 2 · 0⤊ 0⤋