Alright I'm pretty damn handy when solving technical issues however this one is out of my hands...
As I idle I get a misfire that causes afrs to jump from low 14's to high 15's.
Cruising causes same symptoms however, today as well as select few day my afrs will go 17+or --- causing very rough jerking at cruising speeds...
I have a fuel pressure gauge and while the car is off I checked it after 30 minutes it was at >10 psi at the rail.
Cannot test wot pressure as the hose isn't long enough for me to see while driving.
I have 3 bar map/tip,
1025cc injectors w/duster tunes.
Typhoon cai
255 pump
New 4306 at .35
New autozone wires
New o2 sensor from autozone ( to see if that was the issue )... Still using with no changes
Swapped coil pack to msd just to try it (and yes it's brand new) no changes.
Stock boost solenoid setup w/ stock wga.
Stock fpr?
I have checked for vacuum leak and fixed two at injector o rings, and at homemade catchcan.
Nothing is working..
Someone suggested exhaust leak near upper o2 sensor but how likely can that cause as severe a condition that I'm having?
I sucked sea foam into intake manifold and saw a bunch of smoke coming from heat shield area however, the shields were on so I couldn't pin point it ( wga rod leak from exhaust manifold too) so It could've been that but is normal to leak from there..
Please chime in... Before I drive the car into a wall...
Have you scanned for codes? If you don't have a dsp try switching the ignition on 3 times and the codes will show up in your dashboard (if any). If an specific cylinder is causing the problem you will see a p030X code where X will be the cylinder that is misfiring. P0300 is random misfire. If you can trace down the misfire to a specific cylinder try switching injectors from one cylinder to another and see if the code changes to a different cylinder, also try switching spark plugs. Random Cylinder can be caused by a faulty coil pack.
I'm no expert but I had a similar condition in my car and after checking everything it turned out to be the fuel pump, when my gas tank was full I would get no misfires but when the level got close to 3/4 I would start getting them again. How long has your wally been in there?
Along with this Astro I can tell you it isn't anything obvious such as codes or the like, My list literally covered most of every possible cause of a misfire and still persists...
So. :/
Any other help is appreciated, will start working on car again this weekend so please rack your brains with me here.
no help huh no problem I found a huge leak at o2 housing and exhaust manifold.. Not sure if copper rtv will hold that heat but I'll give it a go. Thanks all
Cool your in casselberry which is less than 2 hours from where poinciana is if you take I-4 or toll road.
If you wanna stop by I'll be working on the car today lemme know.
As of right now I haven't. Last night I put a thick layer of copper rtv around the area of the exhaust leak but I had to use the car so I think it burnt off while I was driving because it didn't cure. Car seemed fine while it was still on however.
I have permatex exhaust and tailpipe puddy I'm going to put on next. It's good up to 2000 degrees so this won't burn off.
I do also believe it could be the tps wire seeing how it may be original. But I have no cel and my idle isn't bad at all only the misfire. So I'm not sure.
I'll be doing the puddy in a few hours I'll let you know how it goes.
Shitt man I just saw this... I would like to come out there, I got some coil overs I've been wanting to install too , KW variant 2. My best days are the weekends, peace and thanks!
Still haven't figured out my problem and as you can see the post of this thread it's been awhile...
Fixed all exhaust leak except minor leak at turbo flange, and wastegate on exhaust manifold.
Just replaced timing belt, water pump, and idler.
along with all the other things I posted in my original post. I have wiggles the tps and iac wires hoping for fluctuation but got nothing.
Someone please any idea would be great.
The car runs a lot better when it's colder outside. When it's hot or engine heats up misfire gets really bad.
Also if I cruise to a stop in nuetral the car will misfire just as bad even sometimes going --- when this happens the car sometimes shuts off If I'm not in gear.
Edit: I also switched out the intake manifold gasket.
Update I noticed what is causing the car to jerk.
I monitored my injector pulse while driving and it went from. 1500 down to 400 for numerous seconds causing the car to jerk and buck.
Ideas?
And before anyone asks it was not Wot I was just cruising
How are the spark plugs , wires and cool pack? I finally got my coo lovers installed, a little bouncy in the rear so I'll be messing with rebound for a little while ?
Spark is good I replaced everything new... I just noticed however that my turbo wg rpm term pid shows the dc% not going back to 0 after I get into boost... Smh frustrating
What are your afrs doing when it misses? I'm having somewhat similar problems. I have replaced numerous sensors, boost leak tested, fuel pressure checked, compression checked, intake/exhaust manifold gaskets.
My next project will be a leak down test.
I was checking voltage supply to everything in car when I noticed my tps wire was deformed from heat it seemed. Anyway I yanked a little too hard I guess and messed up the connexion...
Whether it was going bad already or not idk but if it was going bad that may have been causing my issue getting the rewire kit in a few day.. Here's hoping.
Maybe I can help you figure out what's wrong with yours while I wait for my parts I did a lot of stuff and learned a lot. Tps rewire never crossed my mind though, never had one go bad :/
I sent my injectors off for a check, and apparently, they were in terrible shape. Two of them only operating at 50%. I should be getting them back today so. I'll report back with results.