Sputtering during acelleration HELP!!!!
Thread Starter
Intermediate
Joined: Nov 2003
Posts: 36
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Sputtering during acelleration HELP!!!!
I have a 1996 Lt4. It was shaking only when I was in a high gear and giving it gas. Lets say doing 40 in 5th gear. I replaced the plugs with Bosch platnums, the regular ones not the by 2 or 4's. The car continued to run exactly the same, a couple days later it started sputtering in all the gears no matter what the rpm's are. The thing is that it only does this while accelerating or at an Idle. If your driving without a load on the engine it drives fine. Please give any Ideas you may have.
Thanks
Greennv
Thanks
Greennv
Burning Brakes
Joined: Oct 2002
Posts: 983
Likes: 1
From: Bergen County NJ
Re: Sputtering during acelleration HELP!!!! (GREENNV)
My '94 was doing the exact same thing. It ended up being a faulty O2 sensor. The failure was intermitent, and I had to leave it with the shop for a couple of days before they nailed it down. The mechenic ran it numerous times with the scanner attached until the fault showed up, then he was able to pinpoint it and replace the faulty sensor. Running strong one again :D
Race Director
Joined: Aug 2003
Posts: 13,421
Likes: 8
From: Lake Mary Florida
Re: Sputtering during acelleration HELP!!!! (GREENNV)
Is it an ignition cut out or a fuel cut out type of 'sputtering"?
You mentioned the plugs, what about new wires?
Have you checked and/or replaced the air filter any time soon, and also take a look at the throttle body. Open the throttle plate up and see if there is build up on the back side possibly beginning to cake on the edges. You'd be surprised how fast it can gum up. If it needs cleaning be sure to use throttle body cleaner not carburator cleaner.
I'm sure you know that on a cold engine start its in SFI mode until the engine is about at 105 which is about when the O2 sensors are at temp and feed valid voltage data to the ECM. At the point it controls idle via the IAC. Monitor the next cold start, is it idling fine as it warms up and at about 105 the idle sputter begins? If so, suspect the O2s and/or the IAC (perhaps a dirty IAC). If not, and its sputtering right away consider the throttle body and our another fuel source component (filter injector etc). Or consider an ignition source (wires, coil opti etc) problem.
That's about all I can think of at the moment. Hope that helps some.
:seeya
You mentioned the plugs, what about new wires?
Have you checked and/or replaced the air filter any time soon, and also take a look at the throttle body. Open the throttle plate up and see if there is build up on the back side possibly beginning to cake on the edges. You'd be surprised how fast it can gum up. If it needs cleaning be sure to use throttle body cleaner not carburator cleaner.
I'm sure you know that on a cold engine start its in SFI mode until the engine is about at 105 which is about when the O2 sensors are at temp and feed valid voltage data to the ECM. At the point it controls idle via the IAC. Monitor the next cold start, is it idling fine as it warms up and at about 105 the idle sputter begins? If so, suspect the O2s and/or the IAC (perhaps a dirty IAC). If not, and its sputtering right away consider the throttle body and our another fuel source component (filter injector etc). Or consider an ignition source (wires, coil opti etc) problem.
That's about all I can think of at the moment. Hope that helps some.
:seeya
Drifting
Joined: Jul 2003
Posts: 1,257
Likes: 4
From: Granite City Illinois
Re: Sputtering during acelleration HELP!!!! (GREENNV)
Welcome to the forum...
I replaced my Bosch platinums after 2500 miles -- went back to the basic AC Delco's, runs much better.
Also I keep my fuel tank topped off; with under four to five gallons in my tank it sputters under hard acceleration.
LOL. As others have said "welcome to the addiction".
Mark
I replaced my Bosch platinums after 2500 miles -- went back to the basic AC Delco's, runs much better.
Also I keep my fuel tank topped off; with under four to five gallons in my tank it sputters under hard acceleration.
LOL. As others have said "welcome to the addiction".
Mark
Thread Starter
Intermediate
Joined: Nov 2003
Posts: 36
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Re: Sputtering during acelleration HELP!!!! (flannel_man)
I just replaced the plugs 2 weeks ago. The original plugs were a whitish color. It looked like the engine was running a little lean. I inspected the wire endings and they looked very good. The problem is getting progressivly worse. I've driven my car 1 time in the past 2 weeks. Life sucks when you got to drive the 88' honda everywhere.
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Thread Starter
Intermediate
Joined: Nov 2003
Posts: 36
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Re: Sputtering during acelleration HELP!!!! (93JetJocky)
It is a gas type of sputtering. It's almost like the sputtering you get when you have a low tank of gas but not same. shorter sputters, when I'm in a high gear and low rpm's the sputter is violent! It scares the crap out of me. I think the problem started when I heard a hissing sound in the engine. I Found that the little 90 degree angle hose leading to the PCV valve had a hole in it the size of my finger. I replaced the Valve and the hose, everything started to go back to normal. The engine starts rough now. It used to just fire up, know it turn and shakes for a couple of seconds.
Team Owner
Joined: Jul 2003
Posts: 24,650
Likes: 8
Re: Sputtering during acelleration HELP!!!! (GREENNV)
Id say catylitic converter may be broken up inside? and rattling and blocking off the flow momentarily with change of RPMS? OR a fuel pump going out? Mine did the same thing, and it was a bad fuel pump, caused by a bad alternator.
Race Director
Joined: Aug 2003
Posts: 13,421
Likes: 8
From: Lake Mary Florida
Re: Sputtering during acelleration HELP!!!! (GREENNV)
Do a voltage check on the O2 sensor(s). At about 105 coolant the O2(s) are about at 300 deg and feeding data to the ECM. Do you have the GM manuals? If so check book 2 for the a better definition of the symptom. They're are pages of them. From surges and chuggles to cut out, misses sluggish etc. Too many to list. But one thing many of the first checks is the "heated" O2 sensor. So try that. If you need specifics let us know I'll try to reiterate them.
You didn't mention whether or not you've checked the throttle body. So pop that air cleaner off and look at it. It could be something a $3. can of cleaner will fix.
:seeya
You didn't mention whether or not you've checked the throttle body. So pop that air cleaner off and look at it. It could be something a $3. can of cleaner will fix.
:seeya
Race Director
Joined: Aug 2003
Posts: 13,421
Likes: 8
From: Lake Mary Florida
Re: Sputtering during acelleration HELP!!!! (GREENNV)
Yeah I guess the heat of the engine is hard on that hose. I just replaced mine too. Noticed it was cracked and hard /brittle when I changed the PCV.
1985, 85, 93, acceleration, acelleration, c5, corvette, hard, high, rpms, spudders, sputter, sputtering, sputters, troubleshooting
