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#1
11-21-2009, 07:02 PM
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3.4l d.o.h.c
Engine backfires while turning over, but will not start.
Ran perfect a couple days ago. Any input would be great. Thanks in advance 
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#2
11-21-2009, 07:20 PM
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Re: 3.4l d.o.h.c
What Elements do you need for a fire?
Air, Fuel, Ignition, and Timing. This is a 1992 with a OBD I system, so there's less codes. The backfire tells us, that you do have some fuel, and fire. Doe's this car have a MAF sensor?
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#3
11-21-2009, 07:34 PM
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Re: 3.4l d.o.h.c
This car does not have a MAF sensor
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#4
11-21-2009, 09:54 PM
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Re: 3.4l d.o.h.c
1995 and newer have OBD II systems, these codes can help us troubleshoot.
Old School Troubleshooting - 1) How many miles are on this car? 2) How many miles are on the old plugs & wires?
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#5
11-21-2009, 10:47 PM
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Re: 3.4l d.o.h.c
1) Car has 142000 miles
2) Plugs and wires were changed about a month ago Recently have done: -timing belt (replace idler pulleys, tensioner, and hydraulic tensioner) -replaced o-ring for distributor drive unit -head gasket on rear bank
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#6
11-23-2009, 02:01 AM
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Re: 3.4l d.o.h.c
Did problem start before or after changing timing belt? This car has the predecessor to the MAF which is the Intake Air temp. sensor.
__________________
 Bearwulf, the "howling Grizzly" of the north.MONOTONY is the worst driving hazard, so SHUT-UP when I'm driving. 97-Lumina LS 1891Argentine 7.65 with scope!
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#7
11-23-2009, 01:55 PM
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Re: 3.4l d.o.h.c
Problem started 2 weeks after the belt was changed. Car ran perfect. shut it down, went to start it the next day and it wouldn't start
Last edited by 92_Lumina_Z34; 11-23-2009 at 06:03 PM.
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#8
11-23-2009, 06:40 PM
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Re: 3.4l d.o.h.c
It's all about timing!
1) Verify and check your timing. A loose tensioner, could of caused the timing to jump a tooth. http://www.automotiveforums.com/vbul...d.php?t=954555
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