99 yukon 5.7 vortec misfire HELP

[SunlitComet]

Any chance a rag got stuck in the intake or something weird like that. At this point you may be down to tear down inspection if we can not find and leaks in gaskets and stuff either. At the very least take off the valve cover. At the most he head.

 

[lifted_yukon22]

When I get time I'm going to take valve cover off and replace the valve springs on #5...the 12 to 14 hour work days gets most of my time....if I got to take head off and reworked I'm going to do both and install some stainless headers while I'm at it..

---------- Post added at 04:31 PM ---------- Previous post was at 04:22 PM ----------

Yea I've had this problem in the back of my head just hoping this wasn't the problem...

 

[lifted_yukon22]

Update motor started knocking....so I got a new gm goodwrench setting in my grandfather's shop....ok I git headers and the upgraded injectors set....I wanna replace the torque converter...I've heard that a tc from a s10 zr2 is a good upgrade is it?

 

[lifted_yukon22]

Also Happy Labor Day

 

[SunlitComet]

Update motor started knocking....so I got a new gm goodwrench setting in my grandfather's shop....ok I git headers and the upgraded injectors set....I wanna replace the torque converter...I've heard that a tc from a s10 zr2 is a good upgrade is it?

what setting? and why add headers when the engine is knocking. what if you have to pull the motor. what is knocking exactly.

 

[lifted_yukon22]

What I meant was I got upgraded injector spider and headers because I got a new gm goodwrench 5.7 crate engine because it it started knocking....while it was out I wanted to change the torque converter because I heard the s10 tc would be a little better performance wise...

 

[SunlitComet]

gotcha. tho know nothing about the s10 converter being better for us.

 

[lifted_yukon22]

The only difference I can find is that the s10 stall rpm is around 1900 and a stock one from a tahoe is about 1400...other than that there the same...

 

[hwhwhw]

What people are after is the increased K-Factor (stall speed). Or to have an S10 and like to think it is a Corvette. But you would be crazy to put s10 v6 TC into a yukon V8, if you ask me.

Go aftermarket if you want a real upgrade (look up B&M Holeshot and you can easily find 2000 or 3000 or even 3500 stall rpm, if you have the 4L80 trans). But are you really trying to launch your yukon off the line? If you just need a replacement you can find oem for a couple hundred and call it a day.





Pretty detailed explanation found here:


http://www.corvettefaq.com/c3/THE HERD Torque Converter Upgrade.htm



You can tell which converter you have by a 4-digit alpha code found on a sticker attached to the converter. Here are the codes on three converters I have seen:


DGHG = stock '94+ Impala converter
DBCF = '86 'vette converter
DBLF = '95+ L35 S10 truck converter
The code is interpreted as follows:


1st Digit = Transmission application
D = 1984-1/2 and up 700-R4, 4L60, 4L60E
C = 1984 and earlier 700-R4, 200-4R, 200C, 325-4L
B = 250C, 350C

2nd Digit = K-factor (stall speed)
K = K-85, 1211 rpm
G = K-100, 1397 rpm
F = K-110, 1611 rpm
E = K-115, 1654 rpm
B = K-140, 2025 rpm

3rd Digit = Clutch and Damper assembly
C = ? (stock '86 'vette)
H = ? (stock '94+ Impala)
L = ? (stock '95+ L35 Vortec S10 truck)

4th Digit = Rear cover
C = 3 lug round
D = 3 lug round
E = 6 lug
F = 3 lug square
G = 3 lug square