sbrocchi

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.

turbored

what happened before #1 wouldn't fire

sbrocchi

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.

Dow.tom

iTrader: (3)

seized?

sbrocchi

not seized. car runs just #1 not firing.

hustler

iTrader: (6)

you're either not getting spark, not getting fuel, or have no compression.

cjernigan

iTrader: (13)

Check your compression. Could have a stuck/burned valve or blown head gasket. Leakdown test preferably.

Arkmage

iTrader: (3)

may have melted a ring land...

Braineack

iTrader: (62)

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.

magnamx-5

iTrader: (7)

My money is on bad compression. Sucks but everything else is there. Is the smoke white, blue, gree, purple? Elaborate please.

cjernigan

iTrader: (13)

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.

sbrocchi

smoke is white.

Braineack

iTrader: (62)

three guesses.

#1 melted piston
#2 blown headgasket
#3 combination of #1 & #2

Arkmage

iTrader: (3)

I'm leaning towards fragged piston... just because there have been a dozen in the last few months on this forum.

sbrocchi

no compression for #1 cylinder.

cjernigan

iTrader: (13)

Well there ya go. When's the teardown taking place?

sbrocchi

already started. Just have the head to remove, everything else is off.

lazzer408

iTrader: (1)

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.

sbrocchi

broken exhaust valve on cylinder #1. Thank god it was nothing more serious. Time to replace and put back together.