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98 blazer sputtering


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babygirlforyou30
New User

Aug 31, 2009, 2:47 AM

Post #1 of 11 (2865 views)
98 blazer sputtering Sign In

I have a 98 blazer it started sputtering while i was driving it. does it at different speeds, cold or warmed up. I have replaced the plugs and wires, fuel filter, and even put in injector cleaner. none of this has helped(or my luck has anything to do with the problem) but it didn't hurt it, still running the same. seems to be getting worse with time. thought it was the converter because it was blowing out sooty smoke from tail pipe but that stopped. any ideas????


Guest
Anonymous Poster

Aug 31, 2009, 3:02 AM

Post #2 of 11 (2859 views)
Re: 98 blazer sputtering Sign In

hold a flimsy piece of paper (dollar bill is usually used) up to the exhaust. If it gets sucked back towards the exhaust it needs a valve job.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 31, 2009, 3:38 AM

Post #3 of 11 (2854 views)
Re: 98 blazer sputtering Sign In

You need to get your hands on a fuel pressure gauge somewhere. This engine uses a high pressure pump and it's very sensitive to fuel pressure.

The spec is 55 to 66PSI but it probably won't even run at 50PSI



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Sep 1, 2009, 1:13 PM

Post #4 of 11 (2832 views)
Re: 98 blazer sputtering Sign In

A simple misfire will give you the same result. Don't jump to a burnt valve so quickly.
Loren
SW Washington


Guest
Anonymous Poster

Sep 2, 2009, 2:32 AM

Post #5 of 11 (2819 views)
Re: 98 blazer sputtering Sign In


In Reply To
A simple misfire will give you the same result. Don't jump to a burnt valve so quickly.


A misfire will create a suction in the exhaust?
How is that possible?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 2, 2009, 3:14 AM

Post #6 of 11 (2816 views)
Re: 98 blazer sputtering Sign In

I'm going to quit replies to annon guests who won't sign in - so sign in!

If a valve is open the same action (of piston) that draws in air and fuel can draw from a tailpipe. That's all that means,

T



Guest
Anonymous Poster

Sep 2, 2009, 3:39 AM

Post #7 of 11 (2809 views)
Re: 98 blazer sputtering Sign In

Post deleted:

No more annon guest posts for sh*t they know little about! Sign in or get out!

T

(This post was edited by Tom Greenleaf on Sep 2, 2009, 4:06 AM)


Guest
Anonymous Poster

Sep 2, 2009, 4:12 AM

Post #8 of 11 (2798 views)
Re: 98 blazer sputtering Sign In


In Reply To
I'm going to quit replies to annon guests who won't sign in - so sign in!

If a valve is open the same action (of piston) that draws in air and fuel can draw from a tailpipe. That's all that means,

T


That's bullSh!t Tom.

We're talking about exhaust valves. The only way that can happen is an improperly indexed cam, a valve stuck open, or a burnt valve.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 2, 2009, 4:21 AM

Post #9 of 11 (2791 views)
Re: 98 blazer sputtering Sign In

It's not bull - a stuck exhaust valve knows diddle whether to take in new fuel and air or suck air from exhaust. Multiple reasons possible. You are correct but being a jerk!

Sign in or your gone!

T



Guest
Anonymous Poster

Sep 3, 2009, 9:37 AM

Post #10 of 11 (2771 views)
Re: 98 blazer sputtering Sign In

why single me out?

(edit - because you won't sign in! What's the problem?)

(This post was edited by Tom Greenleaf on Sep 3, 2009, 9:46 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 3, 2009, 9:44 AM

Post #11 of 11 (2768 views)
Re: 98 blazer sputtering Sign In

Sign in or I'll delete every post you make!

T







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