Mrmerlin

right off the bat your front knock sensor is knackered same will go for the hall CPS and rear knock sensors.
So yes its time to do an intake refresh budget 6K for parts and incidentals and you turn the wrenches.

Johnnycool

hi sorry that pic is a few months old only one i had handy - i have replaced a lot of the electrical connector etc and went over most of the wiring - new leads etc and fixed crumbling plugs with new ones
bit stuck for 6k bill thou - thats not gonna happen :-(

oh and air cleaner fixed too :-)

Johnnycool

Any chance these symptoms cud be a faulty cps ?
It visually(cps lead and connector sound) looks ok but I know this doesn't mean much !

Mrmerlin

CPS could be bad

Johnnycool

well i was gonna at least replace the CPS and see if that helps in the meantime ......... gotta start somewhere i guess

Mrmerlin

its real easy to remove the CPS with the intake manifold and fuel damper and FPR out of the way.

Johnnycool

havent done the CPS yet but did get to check the fuel pressure - was getting 3-3.5bar with pump running (relay bridge) so seems ok
squirting carb cleaner into intake did give uptick in revs and i was able to keep it idleing with squirts but soon as i stopped it dies shortly after ...... just a small update as didn;t have much time to look any further yet :-(

Wisconsin Joe

The first two things I'd suspect from your description are a vacuum leak and a bad Temp 2.

If you can get it running, put a gauge (or a MityVac) on it and get a vacuum reading. If not, a smoke tester (or even a cigar).

Since it's doing it cold, you can simply put a meter on the Temp 2 and see what resistance it shows. I don't know the correct value off the top of my head, but its out there somewhere.

dr bob

Borrow a known-good LH controller and try again. Having the old controller tested by John last year would tell me that the controller was good last year. Car ran fine then too. Now the car doesn't run so well, and your symptoms point towards a failing LH controller.

Just a thought...

worf928

This--^

All 2.3 LH ECUs will fail. Some tests are better or worse than others and LHs that are good today can fail tomorrow.

Johnnycool

yep sounds like it might be time to have it checked again just to be sure
gonna double check temp II as well tonight and pull LH

cheers

Johnnycool

Temp II sensor seems ok was around 3.5k both pins to gnd
Put noid light on injectors firing away
Lh removed and maf off to get checked

outbackgeorgia

Failed LH most likely. They will all fail. Need hybrid chip replaced, then good to go! Send to John Speake for a rebuild/exchange after verifying with a known good one. BTW, they go intermittent, will run fine for hundreds of miles, then, no power.

Johnnycool

no known good ones availabel easily in this contry 928s fairly rare ! - n.ireland
so parts off to john for a look - hopfeully will turn up something as im stumped !
cheers

Johnnycool

ok intial results are maf totally knackered and way out of spec , lh doing some wierd things not sure details but going for rebuild to be sure signs of failing
dunno if either or both of these contribute to my issue but defo both need addressed - hoping its a cure !