Hi,

 

Ive just got my remapped ecu from john and installed it with my greddy boost controller.

 

While setting up the boost controller it has started running poor. I have turned the boost controller down and tried with it off. I didnt get to use it on hi so i was boosting at about 9 psi max ( Although the boost pressure on the boost controller and the after market boost gauge seem to differ).

 

Problem is if i try to put my foot down the car seems to stumble ( car shakes forward and bacckwards) and then cuts out. It also has been back firing. As i put my foot down its as if the turbos start to spool up and then no power.

 

Ran a diagnostic and came up with code 11 cas problem.

 

Reset the ecu and no more problems from cas but still running poor.

 

Will try a boost leak test on Monday.

 

Any ideas what the symptoms sound like?

 

Thanks

 

Paul

Did you have the Greddy installed before the remap?

Make sure the ECU has been connected back up properly!

 

It doesn't always seat properly.

Err sounds like a problem with the new ECU!

Does it run ok on low boost, and when you up the boost does it stumble?

 

A/m boost gauge and boost controller will not always match, trust the electronic controller as real values.

 

Al.

Hi

 

No the boost controller was not installed before.

 

Does not run well on low boost too.

 

Drives fine if i take it easy and dont go over 0 psi.

 

Sure ecu is installed fine not too tight etc.

Boost leak for sure there then matey. Had the same on mine, checked the engine over and nothing, looked under the nose panel and found 1 of my dump valves completely blown from its housing!! Reconnected and all good.

 

HTH

 

Al.

Err sounds like a problem with the new ECU!

 

Afraid Chris may be correct, see if anyone could swap out their ecu with you as a test.

 

Never been fond of ecu chipping by post,too many variables with engine set ups and ecu`s can easily be damaged / bad soldering / corrupted chip etc.

 

Jeff TT

Afraid Chris may be correct

 

Jeff TT

 

Aren't I always? :D

Well almost... LOL

as its been said, either replace your new chip with the oem one or see if anyone near you with a zed can lend you their ecu for 5 minutes to try it.

 

other than that just have a scan round the engine bay to see if any pipes are off that may have been disturbed when fitting the boost controller

 

Mike

Sounds like an air leak to me or perhaps a plug / coil pack gone down. Can you borrow someone elses ECU just to try and see if there is any difference in running.

i would say boost leak also if it runs poor over 0 PSI

Thanks for all the help and advice guys.

 

Got a couple of spare ecu's so will try that after i have checked for a boost leak.

 

Cheers

Right done a boost leak test and found 3 leaks.

 

First one was one of the front 4 pipes, easy.

 

Nest one was on the plenum near the pcv valve on the drivers side. Actual small crack on the plenum. Gonna need a new plenum!

 

3rd on was on the IAA valve.

 

Put the boost controller on low settings to program it up.

 

All went well and was boosting fine ( had the boost set at 9 psi max).

 

All of a sudden the fault developed again.

 

Turned the boost controller down and it is still doing it.

 

Symptoms are the rev guage goes all over the place no power and lots of back firing, and sometimes stalling.

 

Ran out of time on the ecu swap over so ill see if i can get that done tomorrow.

 

:headvswal :headvswal

Another PTU failure I reckon!

 

Must have said that about 10 times this week! LOL

Its a series 2 ptu.

Its a series 2 ptu.

 

Unlikely to be that then!

> Symptoms are the rev guage goes all over the place no power and lots of back firing,

 

that's a typical CAS problem

also you mentioned you had an error, indicating something wrong with the CAS.

 

check/clean the CAS connector and plug and see if that helps, otherwise try another CAS

Just done another ecu test and cas fault is there again. Will swap it over and hopefully problem solved.

 

How easy is it to replace cas?

Mark the position of the Cas, undo the three bolts, disconnect the plug and remove. Replace in reverse order lining the new Cas to the marks.

 

Paul

hopefully you can now get your 300 sorted mate. Boost leak and a faulty cas. I have many boost leaks in the past and your description matched that to what i have experienced. Keeps us informed matey when you replace the cas unit to see if the fault goes.

 

Al.

Mark the position of the Cas, undo the three bolts, disconnect the plug and remove. Replace in reverse order lining the new Cas to the marks.

 

Paul

 

Sorry for sounding thick but...... What do i mark the cas to? Do i put a mark where the timing mark of the cam pulley is in relation to the cas?

 

Thanks

Just mark the outline of cas to the cas holder.

 

Paul

Erm, the 3 securing bolts mate.

Each bolt that secures the cas to the holder back plate goes through a slot, with a felt tip pen draw around each bolt (top 2 will do) so that when the cas comes off and you refit, you know exactly which position to turn it until the bolt heads line up with the pen marked circles.

smithy

Hi

 

Changed cas over and all seems well. Woo Hoo.

 

Will try and setup boost controller tomorrow.

 

Thanks for all the help and advice guys much appreciated.

 

:duffer:

Rev gauge jumping about prob means bad CAS to be honest as it's what generates the RPM signal, have you got a spare?

Failing that, hook up conZult if you have it and see what the CAS signal does as the problem starts.

I can send you another ECU as a swap out if you want but I don't think it'll be the problem.

 

DOH! SOrry had only read first page when I replied!