WTF?? Help!
WTF?? Help! All of a sudden the other day when I left my car started to stumble, like it wasn't getting any gas or something was off. I would give it and and it would just stumble and drop in rpm's, not moving. It even died completely on me once. I had this problem before and then it just all of a sudden stopped a year ago.
So I replaced the front o2's with bosch 13111's yesterday and it seemed fine everytime I took it out. I thought that might have been the problem so I was relieved that it was running fine. Until tonight I left to go somewhere and low and behold it stumbles again, when giving it gas the rpm's drop and it wants to die, then finally gets gas and takes off. So the o2's weren't the problem after all since it is still doing this and no o2 sensor codes..
any ideas on what it might be? I have cleaned the MAF but that doesn't seem to help. Also I was planning on doing a cam install soon and then getting it tuned so when the tuner I go to does the tune would he be able to tell maybe what it is or not? I don't want to do the install and then my car still runs like sh*t.
sorry for the long post.
any suggestions are greatly appreciated.
So I replaced the front o2's with bosch 13111's yesterday and it seemed fine everytime I took it out. I thought that might have been the problem so I was relieved that it was running fine. Until tonight I left to go somewhere and low and behold it stumbles again, when giving it gas the rpm's drop and it wants to die, then finally gets gas and takes off. So the o2's weren't the problem after all since it is still doing this and no o2 sensor codes..
any ideas on what it might be? I have cleaned the MAF but that doesn't seem to help. Also I was planning on doing a cam install soon and then getting it tuned so when the tuner I go to does the tune would he be able to tell maybe what it is or not? I don't want to do the install and then my car still runs like sh*t.
sorry for the long post.
any suggestions are greatly appreciated.
is the car throwing any codes? more than likeley it is a missfire code..check your plugs and wires...and again check your 02's...how many miles are on this car? if it will run at all and there is an autozone or advanced auto near by they have an OBD2 scanner and will check your codes for free...that should be of some help or atleast get you pointed in the right directioni!!
Launching!
Joined: Aug 2005
Posts: 213
Likes: 0
From: NWFL, AKA - Redneck Riviera
Try unplugging the MAF. If the MAF is the problem, the car should run better since it will stay in open loop, using the MAP sensor instead of the O2's and MAF. Had this problem with a Grand Prix GTP, and cleaning the MAF didn't work, but unplugging was fine. If you don't notice a difference with the MAF unplugged, it's something else.
Also, it's possible that you might be having fuel injector problems. My Z28 would sputter and then start going, blowing black smoke and unburned fuel, but only if it was a cold start. Happened to be two clogged injectors on the passenger bank, which caused a lean condition on two cylinders and rich condition in the other two. Lastly, just an idea, the fuel filter could be clogged, not allowing enough fuel.
If you have any codes, post them up. Hopefully you'll get some soon, which willl make things easier.
Also, it's possible that you might be having fuel injector problems. My Z28 would sputter and then start going, blowing black smoke and unburned fuel, but only if it was a cold start. Happened to be two clogged injectors on the passenger bank, which caused a lean condition on two cylinders and rich condition in the other two. Lastly, just an idea, the fuel filter could be clogged, not allowing enough fuel.
If you have any codes, post them up. Hopefully you'll get some soon, which willl make things easier.
Originally Posted by Black FormulaLs1
is the car throwing any codes? more than likeley it is a missfire code..check your plugs and wires...and again check your 02's...how many miles are on this car? if it will run at all and there is an autozone or advanced auto near by they have an OBD2 scanner and will check your codes for free...that should be of some help or atleast get you pointed in the right directioni!!
and as far as the fuel filter goes, that shouldn't be the problem I just replcaced it about 5,000 or so miles ago.
Originally Posted by rd_ls1_z
Try unplugging the MAF. If the MAF is the problem, the car should run better since it will stay in open loop, using the MAP sensor instead of the O2's and MAF. Had this problem with a Grand Prix GTP, and cleaning the MAF didn't work, but unplugging was fine. If you don't notice a difference with the MAF unplugged, it's something else.
Also, it's possible that you might be having fuel injector problems. My Z28 would sputter and then start going, blowing black smoke and unburned fuel, but only if it was a cold start. Happened to be two clogged injectors on the passenger bank, which caused a lean condition on two cylinders and rich condition in the other two. Lastly, just an idea, the fuel filter could be clogged, not allowing enough fuel.
If you have any codes, post them up. Hopefully you'll get some soon, which willl make things easier.
Also, it's possible that you might be having fuel injector problems. My Z28 would sputter and then start going, blowing black smoke and unburned fuel, but only if it was a cold start. Happened to be two clogged injectors on the passenger bank, which caused a lean condition on two cylinders and rich condition in the other two. Lastly, just an idea, the fuel filter could be clogged, not allowing enough fuel.
If you have any codes, post them up. Hopefully you'll get some soon, which willl make things easier.
Trending Topics
Launching!
Joined: Aug 2005
Posts: 213
Likes: 0
From: NWFL, AKA - Redneck Riviera
I had to have the dealership pull them since I didn't have the tools to scan the engine properly, nor did I have my service manual, and they just cleaned them out. All I know is that it pissed me off that the mechanics burned over half a tank of fuel and 175 miles on the car to fix the problem....but that was two years ago. Did the mechanic look into any of the history?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by rd_ls1_z
I had to have the dealership pull them since I didn't have the tools to scan the engine properly, nor did I have my service manual, and they just cleaned them out. All I know is that it pissed me off that the mechanics burned over half a tank of fuel and 175 miles on the car to fix the problem....but that was two years ago. Did the mechanic look into any of the history?
Look into the history of what?
Launching!
Joined: Aug 2005
Posts: 213
Likes: 0
From: NWFL, AKA - Redneck Riviera
The computer should save any errors until they clear themselves or someone clears them. When I was having misfire issues, the SES light didn't turn on, however, there was a saved pattern of misfires from previous events that where saved, but did not throw and SES light. Hopefully, there is some saved data that can be retreived using the Tech2 since you're at a dealership.
Originally Posted by rd_ls1_z
The computer should save any errors until they clear themselves or someone clears them. When I was having misfire issues, the SES light didn't turn on, however, there was a saved pattern of misfires from previous events that where saved, but did not throw and SES light. Hopefully, there is some saved data that can be retreived using the Tech2 since you're at a dealership.
alright I will see if he can look into that
also is there any possibility this could be a small vacuum leak? would that cause problems like this?
Launching!
Joined: Aug 2005
Posts: 213
Likes: 0
From: NWFL, AKA - Redneck Riviera
That's a possiblity too, didn't consider that one. Check you EGR system for any issues, like a bad seal or maybe an EGR value problem, but I would think that would throw a code (no EGR for me, so I'm not completely sure). Also, the PCV system may have a leak in it. Maybe check the coils for any problems there, and the spark plugs too, if you haven't already. Hope this helps a bit...
Launching!
Joined: Aug 2005
Posts: 213
Likes: 0
From: NWFL, AKA - Redneck Riviera
Possibly, if it's stuck open allowing more "air" into the intake or a loose/cracked hose, which would cause a lean condition in the cylinders, which may result in your misfire. Really, all you can do is go through each system, being fuel (injectors, lines, filter, pump), vacuum, and then ignition (plugs, wires, coils), to make sure all is functioning and not broken. It's hard to say exactly without a code, being there, or without a service manual....
Launching!
Joined: Aug 2005
Posts: 213
Likes: 0
From: NWFL, AKA - Redneck Riviera
I'm at work, so I don't have the service manual handy to tell you haw to check the coils. I'm not sure where the PCV is on '99's, I think that may have changed the system for the '01's.
