98 Tahoe 350 is a slug

[reloder28]

I purchased this vehicle used 2010. It has had the CSPI changed to MPFI. It has been a mechanical nightmare. It does have a 350 but it is not the 350's we used to build for street machines. My 92 GMC had the 350 with TBI. I wish this Tahoe ran like that GMC did.

What kind of PCM and other computer related changes would I have to make to put a quality 350 in with a TBI or better fuel delivery system? I will change the motor if need be. I just want it to go when I push on the accelerator.

I think that part should be called the prod as opposed to accelerator.

Opinions?

 

[SunlitComet]

Actually your 98 motor is stronger then the tbi. And going carb is a very expensive nightmare. you can get pcm tuned http://blackbearperformance.com/services.asp. They add about-20-25 hp. The scan tune is recommend for your year of suv. Perhaps you can discuss the issues you have had so we can help identify your problem. Have you had a scanner to read and record live data for analysis. It is important to solve any anomalies before it gets tuned. You have any mods done to it?

 

[retorq]

Vortec are slugs.

 

[aj713]

Try spraying out the throttle body with the engine running 2500 rpm- use the whole can. Everytime I get another Tahoe and I do this (because they run horrible) it's runs way stronger..


Sent by carrier pigeon

 

[reloder28]

Actually your 98 motor is stronger then the tbi. And going carb is a very expensive nightmare. you can get pcm tuned http://blackbearperformance.com/services.asp. They add about-20-25 hp. The scan tune is recommend for your year of suv. Perhaps you can discuss the issues you have had so we can help identify your problem. Have you had a scanner to read and record live data for analysis. It is important to solve any anomalies before it gets tuned. You have any mods done to it?

I haven't done anything but spend money on its many repairs and then drive it. No programmers, nothing. I know what 350's are capable of but this one doesn't show it. The SES is currently lit due to an over-rich fuel dump on the right bank which caused the Cat's to light the light, so said the mechanic. I have had major repair bills on this pile since purchase. One cracked head, new MPFI & various other repairs. I want it to run like a 350 should.

 

[aj713]

My 97 I had was a slug too, till I cleaned out the throttle body, put on a new cap, rotor, and e3 plugs, a cold air intake, and swapped out the stock muffler for a power stick. It was much better power and fuel wise. Stick sux . But good luck with it just the same.


Sent by carrier pigeon

 

[SunlitComet]

I haven't done anything but spend money on its many repairs and then drive it. No programmers, nothing. I know what 350's are capable of but this one doesn't show it. The SES is currently lit due to an over-rich fuel dump on the right bank which caused the Cat's to light the light, so said the mechanic. I have had major repair bills on this pile since purchase. One cracked head, new MPFI & various other repairs. I want it to run like a 350 should.

Then get the exact codes so we can help solve them and getting it runniong properly again while saving you some bucks. An over-rich mixture is not good at all.

 

[ccapehartusarmyINF.(ret)]

okay im confused what year is your vehicle because a 2010 yukon tahoe sub doesnt come with a 350 the last vehicle that came with a 350 L-31 motor was the topkick in 2005
do you know wich 350 motor you have
LT-9 L98 L05

 

[reloder28]

The original post reads "98 Tahoe 350 is a slug". It was purchased in 2010. It is a 98 year model.