wont rev past 2250

[Panama]

ive just tried to drive my vl 6 cyl auto home from work and every time it goes above 2250rpm, all revs drop out until i pull my foot off the accelerator.

as soon as i put it back on, it goes sweet unless i go above 2250rpm. it doesnt missfire on one cylinder it wont fire on any of them.

it works fine when in neutral or park, and even when i sit in it and stall it up (foot hard on brake, in gear and rev as hard as you can.)

its got a new cas, new coil, new coil lead and i was looking around wiggling wires on things trying to make it fault but couldnt.

anyone had this before? any ideas what to try?

[VL_5SPEED]

Could possibly be the air flow meter.

[Panama]

yeah cheers mate, i did a search and found a guy having the same trouble adjusted his afm resistance to 3.5v at pins 1 + 6

thought i'd give this a try. cant do it today though as my multimeter's still at work
damn. lol

i'll keep you posted if its still rooted tomorrow arvo.

[jatsvl]

sounds exactly like my car, for four years my car has been doing this I have been told fuel pumps, cas, and afm, i have changed them all and she still does it, I haven't adjusted the afm tho, it is still drivable when I go to start it I let the pump run until I hear it stop (7 seconds) then start it and drives no problems if I start it straight away it won't go over 2000rpm???????????????

[VN_Luke]

take the afm connector off and clean up the contacts perfectly...

[Classifi3d Calais]

if its not the AFM i would look into the fuel pump and fuel pressure regulator. Maybe even dodgy or clogged injectors

[Panama]

ok contacts on afm plug are schmicko.

test volts from pins 1 + 6 at 2.8v. adjust to 3.50v
test volts on pins 3 + 4 at 1.24v

didnt make a smidgen of difference.

will try a fuel filter tomorrow

[Panama]

turned out to be fuel filter. so i rigged up two of them in parallel, so it will hopefully
take heaps longer to clog up.

[greenfoam]

2250 is the revs the VL will cut out at if there's a fault (maf sensor etc) like a limp home mode. I think the filter was a coincidence to what was/is really wrong with the car

[Panama]

Originally Posted by greenfoam

2250 is the revs the VL will cut out at if there's a fault (maf sensor etc) like a limp home mode. I think the filter was a coincidence to what was/is really wrong with the car

youre exactly right, because its did it again today as it was a hot afternoon.

can you possibly find a list of things that cause limp mode? neither max ellery's or haynes have been much help with this problem.

i'm thinking its ignition module.

[jatsvl]

i have posted this problem at least twice to no avail, so i have given up i will just live with waiting 7 seconds to start my car, so, there won't be any quick getaways.
goodluck!

[Panama]

no avail. ive tried an afm, but its the same as it was.

anyone know what bits can cause it to go into limp mode?

[Panama]

ok. so ive:
-checked fuel pressure, and its within specs outlined in haynes manual.

-ive tried a new afm

-its got a month old CAS

-it has a month old coil

-ive got a new ignition module.

-ive opened and contact cleaned every block connector in the engine bay

-ive installed 2 new fuel filters in parallel.

ive checked fault codes and they are 14, 23, 24, 31. nothing else

and it still wont rev past 2500 without dropping out. only happens when the air is warm though. the engine dies, and drops to 1500rpm, but if you hold your foot flat, it goes in spurts. doesnt cut out completely.

surely this must have happened to someone else at some time.

[maxpower QLD]

What brand of AFM are u using ? becouse there is BOSCH and then there's those cheap n nasty ones off Ebay , i think there a borg brand , i bought one off ebay last week "brand new" and it's a peice of crap .