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92_Lumina_Z34
11-21-2009, 07:02 PM
Engine backfires while turning over, but will not start.
Ran perfect a couple days ago.
Any input would be great.
Thanks in advance

danielsatur
11-21-2009, 07:20 PM
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?

92_Lumina_Z34
11-21-2009, 07:34 PM
This car does not have a MAF sensor

danielsatur
11-21-2009, 09:54 PM
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?

92_Lumina_Z34
11-21-2009, 10:47 PM
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

Bearwulf
11-23-2009, 02:01 AM
Did problem start before or after changing timing belt? This car has the predecessor to the MAF which is the Intake Air temp. sensor.

92_Lumina_Z34
11-23-2009, 01:55 PM
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

danielsatur
11-23-2009, 06:40 PM
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/vbulletin/showthread.php?t=954555

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