Corndog Man

What is the thread size on the 1999 3.8 LTZ? I have the plug number. Need to get a compression gauge and want to get the right size thread.

I am finally back to doing some diagnostics. I am pretty sure i have a slipped timing chain. I have been checking voltages and everything else and those all seem to check out great. FUel pressure is also in specs. It has to be the timing chain.

14MM?

Corndog...

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1939 Master 85
1990 Cub Cadet 1541
1999 Lumina LTZ
2004 Avalanche Z-71
2007 Sky Redline
2009 Pontiac Vibe GT

brcidd

Your compression gage will come with any and all thread sizes adapters you need-- yours will be the most common-- if it doesn't- it is a real cheapo gage..I think mine has only two adapters....

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Automotive A/C Engineer with:

'95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone- blown head gasket
'92 Chevy Lumina Van 3.8L 264k miles
'86 GMC S-15 - 2.8L 154k miles
'86 Buick Park Ave 3.8L 199k miles- my daily driver
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles- my high school car!!

All but the Camaro and Firebird are white....

Corndog Man

It's a cheap one (20 bucks, no adapters). I think the size is right but its so short it wont reach the threads.

Corndog...

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1939 Master 85
1990 Cub Cadet 1541
1999 Lumina LTZ
2004 Avalanche Z-71
2007 Sky Redline
2009 Pontiac Vibe GT