Hi folks,

 

Just been out in the zed about 30 miles or so and it was behaving like poo :( Don't know if it is engine or autobox related, can you help?

 

Some background: Did some work on it on Saturday - SE chip, boost jets to 12psi, adjusted TBs to open fully, replaced all pcv hoses and valves.

 

The day of the work the car was amazing :) But tonight very strange things happened:

 

On ignition the "Power" light on the dash blinked 5 or 6 times. The idle was up to 2000rpm. The engine had a different, almost whiney, noise to it, the pitch rising with the revs.

 

Driving it, the car felt breathless and hesistated and the revs jumped around 2500 to 1000 up and down, jerking the car. This stopped when the car warmed up but then when I tried boosting - at max boost the car would stop accelerating and make a "Bum, bum, bum" noise - the revs jumping about again :confused: causing engine braking. It did this most of the journey.

 

Later, nearing home, off a roundabout the revs jumped about again and the car wouldn't accelerate from about 20ish. I stomped on the gas pedal a few times and the car stuttered up to speed. Then it boosted well, through the gears - but the autobox upshifted at 5000rpm each time :confused: and "Power" wouldn't automatically engage.

 

Stopping - the big fan was on full blast and the revs high.

 

I've got a tank optimax in, is the "bum bum" sound detonation (I've never heard it) or the autobox clutch slipping or something else? :(

 

Can anyone diagnose from my v long winded description? The car was ok before chip+boost, though boosting had felt a bit slow - not as instant as usual.

 

Big thanks :)

 

Pete

Oh yeah - the dropping of revs with the noise also happens when pushing the accelerator in Neutral :confused:

Pete did you clean the TB's when you did the thingy on em? If not it may have some shyte lodged up in em causing the TB's not to open /close right.

 

Good Luck.

 

I believe that Det sounds like a marble being shook in a bucket, but i dont think ive ever heard it:confused:

Det does sound tinny, stones in a tin sort of noise.

Hmmm it is definately not detonation then :) I'll take the battery off while at work today and try it again later.

 

Berks - the TBs are nice and clean but I'll check they are opening correctly at WOT :)

 

:(

 

Cheers, keep 'em coming :)

 

Pete

Check the yellow temp sensor connection ;)

 

CheerZ,

 

Andy

check for an ecu error

Yeah - the power light flashing like that is telling you that the auto gearbox ECU has a stored fault code, so do an Autobox diagnostic as well as a main ECU diagnostic (the fault codes are often linked), and see what they read as.

 

Given that power isn't working (is kickdown?), I'd look at the TPS, too..

Also check your vacum hoses for splits or make sure they are all on as this happened to me, funny idle boosting o.k. till later up the rev range and then a sort of holding back, it was because one of my vacuum hoses had split creating an air leak !

 

Good luck.

 

Olly.

Thanks guys :)

 

I'll print this out and attack the car tonight ;) Andy - I fitted a new temp sensor the other day - dont think its that. It feels like its ECU related - Autobox or Engine :confused: And given that I've recently got an SE chip installed its probably to do with that.

 

Are they any compatibiltiy issues with autoboxes and ECU upgrades??

 

Will do the diagnostics and check all the vac hoses - which I'm renewing soon :D, and report back :)

 

Cheers

 

Pete

Pete,

Worth remembering we did remove the TPS plug at one point, maybe broke a cable inside - they are pretty susceptible to heat damage if the boot was anything to go on. Can cut it back and resolder.

Give me a buzz if I can help you out with anything.

CheerZ

Did the main ECU check - 55 all clear :)

 

Will have to wait to do the autobox as the bulb for the light isn't working :rolleyes: - I'll swap some bulbs around and try again tomorrow...

 

Talking with JD, its probably the wire or connector to the TPS as I wrenched it around a bit the other day :o so may have broken a connection somewhere. The autobox ECU check will show this though, looking at the list of fault outputs :)

 

Thanks for the help everyone, more money saved hopefully ;)

 

Pete