98 gmc sierra,4.3vortec f/i


Old 01-18-04, 11:09 AM
reyes45's Avatar
Thread Starter
Join Date: Mar 2003
Location: Michigan, USA
Posts: 71
98 gmc sierra,4.3vortec f/i

I have noticed a problem w/ truck on cold starts. Every time I start in the morning it rattles like a diesel engine. The noise starts to go away as the engine warms up untill it dissapears. The colder the weather the louder the noise. Asked a few knowhow friends and they said it sounded like a rod nock but rod knock get louder as the engine gets warmer don`t they. Had problem for about 3 mos. All input appreciated. THANKS GUYS.
Sponsored Links
Old 01-18-04, 02:00 PM
Desi501's Avatar
Join Date: Oct 2003
Location: Boynton Beach Florida
Posts: 2,207
I hope your using the 5W30 oil that is required for that truck. If your not, change it immediatly and you'll see a difference. Heavier oils will do serious damage in extreme cold weather.
Old 01-18-04, 04:31 PM
reyes45's Avatar
Thread Starter
Join Date: Mar 2003
Location: Michigan, USA
Posts: 71
I always use 5w30 castrol. sometimes I`ll switch to 5w30 mobil-1 syn. problem is the same. If I accelerate engine when it`s cold noise gets louder but after it warms up it runs great and purss like a kitten. Any more inputs will be greatly appreciated.
Old 01-19-04, 02:36 PM
Join Date: Apr 2002
Location: Pittsburgh,Pa
Posts: 2,417
It may be carbon deposits.Try using top engine cleaner on the truck(available at a Gm dealer)if that doesn't solve the problem you may need a tensioner kit installed to reduce the noise from the balance shaft.
Old 01-19-04, 09:26 PM
Visiting Guest
Posts: n/a
cold starts

davo, how does a tensioner kit help eliminate the noise?

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes