95badboy

I put a cam in my 02 lq4 Silverado its a 206/212 515/522 lift and it is backfiring now while idlen and lettin off the throttle I removed my egr also wat could be the cause of this. I was told it could be from bad gas which it has set since early april this is my first swap iv done so this has me lost thanks in advance

Old Geezer

iTrader: (3)

First, it's time for a data log to pinpoint the issue[s], if any.
Next it's time for a tune....

95badboy

Where do I start on a data log this is all new to me

TransamGCS

iTrader: (2)

you would have to have something like HP tuner, did you get a tune after you installed the cam? if not then you need to get a dyno tune done by a good tuner that has knowledge with these engines. also did you triple check to make sure the dots are lined up on the cam sprocket

gMAG

iTrader: (1)

If you have installed a cam, only, I would go for a mail-order tune. It's alot cheaper, and will put your air/fuel in the proper range.
Frost did mine, and there are a number of other reputable mail-tuners on this forum.

95badboy

No tune yet will be gettin one soon but Idk by who yet and yes on the dots

95badboy

that's all iv done is cam is there any good tuners near northeast al so I could drive and have it done instead of rikin losin it in the mail

gMAG

iTrader: (1)

Slowhawk (a sponsor) is in MA, off of I-495.
Do you live in AL? That's quite a drive.
Besides, if you're having trouble with the engine right now, driving a distance is prob not recommended.
There are other dyno-tuners in the NEast, but I'm not familiar with them.
No one will lose your computer, if you do a mailorder tune.
Steve @ Frost (sponsor) will do a great job, and his customer service/followup made me very satisfied.
John @ Speartech (sponsor) is great, too.

95badboy

Yes I live in northeast alabama I'm considering using frost iv read many great things bout them

baxsom

iTrader: (6)

gas from april of this year is still fine. hopefully the pushrods are the correct length for your cam and lifters and a valve isnt being held open.

95badboy

I contacted comp and they told me that were the ones I needed so i went with those 7.400

remauto1187

iTrader: (1)

Im curious, how does comp cams know what your correct pushrod length is suppose to be? Did they sneak into your garage or driveway and do a black ops mission with precision measuring tools on your engine?

Typically pushrod length would change with head gasket thickness change or head/block machining.

95badboy

It's called the contact us link i told them I was usin there cam and everuthing else was stock including gaskets and heads and they gave me the length i needed