about 2 weeks ago i washed my car at the car wash. everything was fine...until i left. i did NOT wash the engine or even pop the hood while i was at the car wash. right after i left the car would start bucking really bad and it wouldn't rev over ~3000 RPM . i wasn't getting any SES light and i checked for codes and nothing. even at idle it will act like it has a 3000 RPM rev limiter. the problem is also intermittent. sometimes it's just fine but 95% of the time it's not. i checked fuel pressure at idle and it was 36psi, and also noticed that the right after i turned off the engine i could press in on the schrader valve on the fuel rail and almost no fuel came out. so i just thought it must be the fuel pump....
so i bought a new Walbro 255 fuel pump, exactly the same Walbro fuel pump that Kenny put in his TGP. i also replaced the filter (which was not clogged at all), replaced all fuel line O-rings and vacuum lines etc. and....the problem is still there :icon_mad: i spent all day getting that damn thing installed laying on my back in a puddle of slushy water :icon_evil:. oh well, i've been meaning to install a Walbro 255 for a long time now so i guess it's not all bad. it still won't rev past 3k RPM. it will actually make it almost to 3500 RPM but it will just go right back down and bounce from 3000 RPM to 3500 RPM over and over just as if it had a rev limiter set at 3000 RPM in the chip. i can floor it at idle and it does this. if i drive the car any RPM past ~3000 will make the car go nuts (bucking BAD).
any ideas? the CPS is only about 2 years old, however i've never changed the MAP sensor or TPS. i thought if these were the probems i would get a code but i'm not getting any. i'm going to break out my brother's OTC 4000E scanner and see what it shows, but i'm really not sure what to look for...
any help appreciated, thanks!
cant rev above 3k at all?? what about if you downshif from 50 MPH into 3rd? what happens then
How did you rig the neutral safety switch? Sounds like that is the problem. The chip/ecm thinks it is in neutral/park.
Quote from: TGPilot on February 05, 2007, 06:41:10 PM
How did you rig the neutral safety switch? Sounds like that is the problem. The chip/ecm thinks it is in neutral/park.
i just spliced together the large yellow and purple wires together using solder, a bit of paste flux, a Bernzomatic pen torch and then used heat shrink tubing. it was a very good splice but i'll double check that. i never did use the clutch safety switch so the ECM always thinks the car is in gear.
here's some pics of the fun i had today:
(http://www.turbosedan.com/cutlass/DSC03298.JPG)
(http://www.turbosedan.com/cutlass/DSC03299.JPG)
it was in the low 40s but it SUCKED because of all the snow melting. i was completely soaked after getting done.
crappy vid but here is what it's doing:
http://www.turbosedan.com/cutlass/engine/cutlassproblem.MPG
i would def say thats the netural safety switch
thanks guys, you were both right on! i went out and wiggled the splice i made and that "fixed" the problem. here is what it revs like now:
http://www.turbosedan.com/cutlass/engine/cutlassproblemfixed.MPG
love that BOV :icon_mrgreen:
it's not really fixed yet, but it will be tomarrow after i redo the splice. some water must have gotten into the heat shrink tubing or something when i was powerwashing the driver's side wheel well.
Quote from: TurboSedan on February 05, 2007, 07:15:32 PM
Quote from: TGPilot on February 05, 2007, 06:41:10 PM
How did you rig the neutral safety switch? Sounds like that is the problem. The chip/ecm thinks it is in neutral/park.
i just spliced together the large yellow and purple wires together using solder, a bit of paste flux, a Bernzomatic pen torch and then used heat shrink tubing. it was a very good splice but i'll double check that. i never did use the clutch safety switch so the ECM always thinks the car is in gear.
actually i just thought of something. the yellow and purple wires are for the clutch starter switch so that can't be it otherwise i couldn't even start the car. the P/N safety switch must be one of the other splices i made. i'll be looking into that today.
i am using a TGP wiring harness and i did do the correct splices for the P/N safety switch (so the car always thinks it's in gear) and starter switch (so i can start the car without pressing the clutch pedal to the floor) BUT i stil have two wires - an orange/black wire & a black/white wire that i have no clue what to do with. they have always been just cut and laying there going nowhere. i've looked at wiring diagrams and searched/asked on forums and still can't figure out what they are used for. those two wires have been cut just going nowhere since i turbocharged the car in 2005; no issues at all until now. maybe one of them is grounding out on something? i wish i would have checked out Kenny's TGP while i was down there last November.
i have a feeling it must be one of the other splices that went bad. i'll get it figured out today. for now the problem is still intermittent but since i wiggled the wires last night it now only cuts out at 3000 RPM about 1/2 the time not 90% of the time like before....so obviously a bad splice in there somewhere. making new splices is going to suck with the turbo in the way :icon_confused: hopefully there is enough length in the wires to pull it up a ways so i have room to work.
Quote from: TurboSedan on February 06, 2007, 11:15:07 AMBUT i stil have two wires - an orange/black wire & a black/white wire that i have no clue what to do with. they have always been just cut and laying there going nowhere. i've looked at wiring diagrams and searched/asked on forums and still can't figure out what they are used for. those two wires have been cut just going nowhere since i turbocharged the car in 2005; no issues at all until now. maybe one of them is grounding out on something? i wish i would have checked out Kenny's TGP while i was down there last November.
BINGO! i found it! that unused orange/black wire was grounding out on the transmission case. i tested this by grabbing the orange/black wire (which now had about 1/8" stripped off the end unlike before) and holding it (so it wasn't grounding to anything). then i grabbed the throttle arm and the engine revved past 3000 RPM just like normal. i then grounded the wire to the turbine and sure enough, it would rev to 3000 RPM and no higher. then while it was doing this (bouncing off the 3000 RPM rev limiter) i pulled the wire away from the turbine and the RPM instantly went right up past 3000 RPM again. soooo....i'm going to fix the problem by cutting the stripped end of the orange/black wire off then use some heat shrink tubing to keep it from grounding out on anything ever again. i will be doing the same with the unused black/white wire just hanging there.
i love easy fixes :icon_biggrin:
First thought in my mind. ;)