Sputtering.. some kind of misfire??
Apr 12, 2004, 11:00 PM
#1
Evolved Member
Thread Starter
iTrader: (1)
Join Date: Apr 2003
Location: Daytona Beach, FL
Posts: 1,571
Likes: 0
Received 0 Likes
on
0 Posts
Sputtering.. some kind of misfire??
For a few days now this has been happening, I thought it was bad gas, but I have added gas twice since and it still does it.
Well what it does is (pretty much from a stop or when I'm coming to a stop but speeding up again) my car will like sputter and go slow. I can hear it because of my exhaust, it sounds like.. bup,bup,bup,bup.. like backfire sounds but a little lower and quicker sounding. If I let off the gas it will stop and I will accelerate like normal. From a stop if I go slow and take it easy. my car will go fine, but if I just give it a little more gas (not to the floor, but just a little quick) it will do it. If I floor i, it will do it and barely go anywhere, just moves a little with the sputtering.
At first it was just like a little pop, almost like a backfire when shifting, but just normal acceleration, and now it will do it pretty bad if it downshifts into like second of first or when coming from a stop.
Anyone know what this can be. I have the day off tomorrow and I am going to inspect my engine.
Engine mods I have:
Header (maybe a bolt is loose, came loost, leak?)
Intake (don't think it is really from that)
Exhaust (probbaly not)
Also, I had the RRM piggyback, but took it out and hadto reconnect one of the wires... the red/white one.. maybe that came loose? I will chec that also tomorrow.
Or it could be something in the car. I changed the spark plugs about 2 months ago, but they haven't given any problem.
I'm thinking I might change the fuel filter?
Well what it does is (pretty much from a stop or when I'm coming to a stop but speeding up again) my car will like sputter and go slow. I can hear it because of my exhaust, it sounds like.. bup,bup,bup,bup.. like backfire sounds but a little lower and quicker sounding. If I let off the gas it will stop and I will accelerate like normal. From a stop if I go slow and take it easy. my car will go fine, but if I just give it a little more gas (not to the floor, but just a little quick) it will do it. If I floor i, it will do it and barely go anywhere, just moves a little with the sputtering.
At first it was just like a little pop, almost like a backfire when shifting, but just normal acceleration, and now it will do it pretty bad if it downshifts into like second of first or when coming from a stop.
Anyone know what this can be. I have the day off tomorrow and I am going to inspect my engine.
Engine mods I have:
Header (maybe a bolt is loose, came loost, leak?)
Intake (don't think it is really from that)
Exhaust (probbaly not)
Also, I had the RRM piggyback, but took it out and hadto reconnect one of the wires... the red/white one.. maybe that came loose? I will chec that also tomorrow.
Or it could be something in the car. I changed the spark plugs about 2 months ago, but they haven't given any problem.
I'm thinking I might change the fuel filter?
Last edited by pumpdog720; Apr 12, 2004 at 11:04 PM.
Apr 13, 2004, 10:43 AM
#4
Evolved Member
iTrader: (1)
Join Date: Oct 2003
Location: Westchester NY
Posts: 884
Likes: 0
Received 0 Likes
on
0 Posts
As a long time 4G63 owner I might be able to help with this one...Did you have your defroster on when this happened? It seems to me that there is something with the A/C/defroster that causes alot of stress of the electrical sytems and will cause the car to sputter at very low RPMs i.e stopping or standing. I haven't tried the grounding wires yet but I would guess that they might help.
Apr 13, 2004, 10:56 AM
#6
Evolved Member
Thread Starter
iTrader: (1)
Join Date: Apr 2003
Location: Daytona Beach, FL
Posts: 1,571
Likes: 0
Received 0 Likes
on
0 Posts
Alright, I just went out and looked. I popped the hood and when I push down the throttle cable the engine starts jerking a bit. Not if I push down a little, but maybe towards half throttle. This is just revving it up not even driving.
Apr 13, 2004, 11:06 AM
#7
Evolved Member
Thread Starter
iTrader: (1)
Join Date: Apr 2003
Location: Daytona Beach, FL
Posts: 1,571
Likes: 0
Received 0 Likes
on
0 Posts
I just took it for a drvie real quick, A/C and defrost was off and still did it.
From a complete stop, I did just a little over half throttle to see. It started sputtering and I was barely moving. I just kept on the gas and it finally like caught up or something and started going like normal. But I didn't even release the gas but it caught up.
Could it be the header(RRM)? A lot of pressure on the low RPMs. MAybe the gasket is broken? Maybe I thightened the bolts to tight. But I have had the header for like 6 or 7 months now. Could it just start doing it now?
If it is the gasket, where should I go for a new one?
From a complete stop, I did just a little over half throttle to see. It started sputtering and I was barely moving. I just kept on the gas and it finally like caught up or something and started going like normal. But I didn't even release the gas but it caught up.
Could it be the header(RRM)? A lot of pressure on the low RPMs. MAybe the gasket is broken? Maybe I thightened the bolts to tight. But I have had the header for like 6 or 7 months now. Could it just start doing it now?
If it is the gasket, where should I go for a new one?
Trending Topics
Apr 13, 2004, 11:14 AM
#8
Evolved Member
iTrader: (15)
Join Date: Feb 2002
Location: nj
Posts: 745
Likes: 0
Received 0 Likes
on
0 Posts
did your mas aitrflow sensor come unplugeed?
the car has a emergency run mode that the ecu tAKES OVER WIHT WHEN CERTAIN SENSORS ARENT PLUIGGED IN I HAD THIS PROBLEM ONCE BEFORE i though it was snapped on all the way but it wasnt securly conected and that what i got it drove me nuts for days then i brought it to the dealer and they tried telling me a sensor was busted and to buy a new one
check harnesses lots and lots of harnesses
the car has a emergency run mode that the ecu tAKES OVER WIHT WHEN CERTAIN SENSORS ARENT PLUIGGED IN I HAD THIS PROBLEM ONCE BEFORE i though it was snapped on all the way but it wasnt securly conected and that what i got it drove me nuts for days then i brought it to the dealer and they tried telling me a sensor was busted and to buy a new one
check harnesses lots and lots of harnesses
Apr 14, 2004, 01:29 PM
#12
Evolving Member
Join Date: Feb 2002
Location: North Central MA
Posts: 404
Likes: 0
Received 0 Likes
on
0 Posts
Mine was doing this for a while, then one day (monday actually) it threw a CEL, so I popped on the code reader. Misfire on 4. I looked at everything, it all looked secure, all the plugs were in perfect shape, so when I tossed it back together, swapped #1 and #4 plugs... seemed to take care of it... but that's just some mumbo-jumbo...
As for a real solution... I don't got one. But I did have the problem.
As for a real solution... I don't got one. But I did have the problem.
Apr 14, 2004, 01:36 PM
#13
Evolved Member
iTrader: (3)
Join Date: Apr 2002
Location: Somerset, KY
Posts: 1,509
Likes: 0
Received 0 Likes
on
0 Posts
To me it really sounds like bad readings from the MAS. If you reset the car (disconnect battery for a bit then reconnect) it whould fix that. Our ECU's are wacky like that. I also get that little stall/jumpy thing if i have my defroster on, AC is fine though.
