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Old 09-05-2007, 10:27 PM   #1
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Default #1 wont fire.

Hi there,

I have a M1 with a 93 1.6 greddy turbo, intercooled and msd timing boost. I am having a problem with #1 cylinder,it will not fire. I have replaced the plugs,injector,checked spark(it's good),no codes are being thrown. Checked timing it is fine. What could possibly be the problem. The boost guage is bouncing everywhere in vaccum. I am also now blowning smoke on throttle.
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Old 09-05-2007, 10:29 PM   #2
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what happened before #1 wouldn't fire
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Old 09-05-2007, 10:32 PM   #3
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traveling at @ 100 mph and suddenly there was a loss of power and temperature guage flew in the H zone , had to let off throttle and temp came back to norm and has stayed there since but #1 won't fire.
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Old 09-05-2007, 10:53 PM   #4
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seized?
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Old 09-05-2007, 11:35 PM   #5
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not seized. car runs just #1 not firing.
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Old 09-05-2007, 11:43 PM   #6
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you're either not getting spark, not getting fuel, or have no compression.
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Old 09-06-2007, 12:31 AM   #7
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Check your compression. Could have a stuck/burned valve or blown head gasket. Leakdown test preferably.
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Old 09-06-2007, 01:02 AM   #8
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may have melted a ring land...
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Old 09-06-2007, 09:22 AM   #9
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if you have spark in #1 then you dont have enough air or fuel...

I'd go with a leakdown test and see where your compression is going.
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Old 09-06-2007, 09:38 AM   #10
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My money is on bad compression. Sucks but everything else is there. Is the smoke white, blue, gree, purple? Elaborate please.
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Old 09-06-2007, 09:39 AM   #11
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If you end up wanting to buy the tool, harbor freight sells a leakdown tester for $39.99 and it goes on sale for $19.99 sometimes.
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Old 09-06-2007, 10:41 AM   #12
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Quote:
Originally Posted by magnamx-5 View Post
My money is on bad compression. Sucks but everything else is there. Is the smoke white, blue, gree, purple? Elaborate please.
smoke is white.
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Old 09-06-2007, 10:53 AM   #13
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three guesses.

#1 melted piston
#2 blown headgasket
#3 combination of #1 & #2
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Old 09-06-2007, 12:51 PM   #14
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I'm leaning towards fragged piston... just because there have been a dozen in the last few months on this forum.
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Old 09-06-2007, 04:28 PM   #15
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no compression for #1 cylinder.
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Old 09-06-2007, 04:29 PM   #16
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Well there ya go. When's the teardown taking place?
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Old 09-06-2007, 04:52 PM   #17
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already started. Just have the head to remove, everything else is off.
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Old 09-06-2007, 05:36 PM   #18
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Bent intake valve(s) if your gauge is bouncing at idle. My guess. 'corse the lack of vacuum from a toasted piston could make it bounce as well.
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Old 09-07-2007, 06:57 PM   #19
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broken exhaust valve on cylinder #1. Thank god it was nothing more serious. Time to replace and put back together.
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