exhaust valve

[Holliday]

Originally posted by f5fstop:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Holliday:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by f5fstop:
It is NOT a bulletin, since so far, the numbers are low.

It is for the Colorado/Canyon.
Been documented back to '04 models.
#04-06-04-081A (11/12/04) </div></BLOCKQUOTE>

I'll repost, "IT IS NOT A BULLETIN FOR THE H3." </div></BLOCKQUOTE>

Nobody said it was. But the fact that GM hasn’t issued a TSB for the H3 doesn’t mean it’s not the problem described in TSB #04-06-04-081A. The I5 3500 is the same across the GMT355 platform and a TSB has been issued for the Colorado/Canyon for the very problem that the thread originator described. Since this issue has been documented on the ’04 & ‘05’s, it’s a safe bet that it will occur on the ’06 H3’s…being that it’s really an ’05-1/2. Having personally experienced the same symptoms as originally described in this thread on my Colorado, TSB #04-06-04-081A was applied and apparently solved the problem. However, there are more than a “few” reports of cylinder head replacements needed to solve the I5 valve train issues. BTW, the problem typically emerges around 12k to 18k miles. I haven’t seen any reports of this issue on the ’06 Colorado/Canyons as of yet, so maybe GM figures it will only occur in a few early H3’s and will quietly go away so they don’t have to issue an H3 TSB. My guess is that there’s been a random recurring problem in the I5 valve train, since there’s no VIN break referenced in the TSB and the problem has occurred across 2 MY’s.

Anyway, I believe it would be useful for an H3 owner that experiences these symptoms to mention to the dealer that a TSB covering the same symptoms has been issued for the Colorado/Canyon I5. It may save the problem from being misdiagnosed, since a Hummer/Caddy dealer probably wouldn’t check Chevy/GMC TSB’s to diagnose an H3 problem. That was my point.

Update: found some new info, break point is Build Date prior to 4/13/05...so that may include some early H3's.