Righty then peeps, some of you will remember my post about my car jerking on WOT recently!
Anyways, went out with jim last night for a drive to see if we could sus out what's happening, and basically this is the jist of it!
Before driving, did an ecu test with one of those gunstons things, and it came up with falut code 68, which on autodata says watsegate recirculation valve- now this would be stoed from before where the car was cutting the ignition from overboost, or whatever.....- checked the amal, and all of the hoses and there wasa split in it near the top, although the car was not overboosting etc...- still htiing what it was before.

Reset the ecu, and took it for a drive, and for about 10 mins was fine through gears 1-4 at WOT to about 6.2k, so we thought the problem was solved- felt completely normal whilst doing this, no loss of power etc.....

Pulled into the petrol station on the A20 to check the ecu for fault codes, and NONE had been recorded, so we thought that we'd solved the problem- off we went, held the car on boost at WOT on the brakes in 3rd to see if it would cut the ignition again, and it did...... ARGGGHHHH

pulled into the layby comming back on the A20, to check the ECU, and once again its reading fault code 68 so there is obviuosly a sensor down, or ecu fault......- MAP was the most obvious- resent the ecu, drove off boost, or only part boost, and checked the ECU again to look for a fault code- fine, so we think we've got the problem solved- connect a multimeter to the map sensor to see if thats at fault, and causing the ignition cut, but its not- its reading exactly as we would have expected...- no weird values when the car is jerking or owt, so it must lie elsewhere...

And this is where you's lot come in- has anyone got any ideas WTF it could be
The car did do it last year with an xr2i act sensor, but i thought this had been solved by putting in a frst act, but as you can see the porblem has returned- im gona check this tonight or tommorow whilst driving, along with swapping the ecu, but has anyone got any tips, or hinst as to what else it could be?? PLEASE, im really starting to getting p'd off with my car

Anyhow, cheers for you help!

 

just to summaries what rolls is saying as its a bit long winded

the car keeps hitting the ignition cut (aka overboost)

the map sensor is reading correctly and the car is boosting at 6psi (so ECU is not sensing too much boost)

when this happens it stores code 68 in the KAM (amal valve)

the amal valve passes does not show a current fault when testing, only shows it as having previously failed (ie in the KAM)

this to me sugests the ECU is trying to drop the boost by killing the amal valve feed, then it senses that the boost DOES'T infact drop so assumes that the amal has failed (it hasn't its just not piped up as the car uses an aftermarket boost controller)

also this problem is seems to only happen under load

will attempt to check ACT sensor voltage later tonight... but its fookin hard trying to buzz out ECU pins with a multimeter whilst youre being propelled at 100+mph in a mk2 ford fiesta with rock hard suspension

 

amal is pipped up though jim, but apart from that, spot on!

 

has it anything to do with your GReddy boost doo-hickey thing-a-ma-bob?

 

Sounds like, overboost to me. Your actuator could be worn.
Get a boost guage on it to see what is REALLY going on.
The eec4 can also test the wastgate AMAL valve for electrical faults.

 

simon car is NOT overboosting, and the ECU is getting the correct reading from the mapsensor 3.6v (ish)

 

ps car is on a 195 chip so should run about 20psi... lol

 

You sure that 'ish' isn't the problem?

 

the ish is my bad memory and trying to stare at a multimeter whilst having the shit shook out of me by a beantin mk2 fiesta with the car jerking all over the place and stabbing myself n the finger multiple times with a multimeter probe

trust me the signal from map sensor to ECU is fine and matches boost gauge fine

 

how much!!!

Thought about detonation? cus if the ECU excessive detect det might cause the problem. Could be tottally wrong.

 

lol. OK then - not that.

 

rolls out of interest yours is a 1.8 zvh right? what head gasket and bolts do you run?

 

madmac well i dunno how much its actually supposed to run... lol but its a lot more than a fucking pony 6psi i can tell you that much

ps the problem with the car only holding 6psi is NOT due to faulty componenets, its due to scaredycat driver

 

Mark- nah, i've not had this before when the boost controler was on, and ive not altered any of the pipework to cause a prob- cou always disconnet it though, and see if that makes a difference!
As for the actuator, it was new, along with the turbo a year ago, so can't see it being that!

James, yeah 1.8 zvh- felpro gasket, and normal, cvh bolts with thin washers!

 

cheers.

 

rich, just spoke to that clever person we were talking about yesterday...

unplug the chip and then try it

i get off work at 5:30 by the way and have no plans for thisevening.

 

cheers jimbo- ill unplug the chip, and go for a spin in a mo- best get some petrol as i did about 10 quids worth yesterday

As for tonight- i can't chap- i gota go work, and can't call in with the shites as i dropped james in earlier

 

top

 

top as in it sorted it withou the chip plugged in

 

i aint tested it yet jim- been getting insurance quotes all bloody day for my bro

 

well drive it chipless on the way to work

oh, and you might want to wind the actuator out a turn or two so it boosts to something stupid like 4psi

then you're guaranteed it shouldnt be hitting overboost