Astra Owners Network banner

1 - 20 of 22 Posts

·
Registered
Joined
·
8 Posts
Discussion Starter #1
Hi Guys,

I have a 57 Reg 1.7 cdti Astra (109k mileage). The fault code I am getting is P0234 Boost Pressure Control Circuit - Negative Deviation.

I've been experiencing a problem with it for around 3-4 months now. When I'm on a bypass/motorway and going over 70 mph (around 2500-3000k revs) my car goes into limp mode - EML appears.

I took it to a garage that is a specialist in Electrical faults. They read the fault code, and claimed that they cleaned the area.. This didn't cure it and left me out of pocket by 84 quid for 2 hours labour.

Since then, I've had my usual mechanic look at it, who has had a look for any leaks and dirt, nor did this fix it. So then I got a Boost Pressure Sensor fitted, which didn't solve it either. I then got a 'Turbo Charger Vacuum Sensor' (I think)... Link below...

http://www.vauxhallworldparts.com/vauxhall.php?partnumber=98105657&partid=628

Ever since I have had the part above fitted, the car still goes into limp mode, but now over 60 mph, and even if I'm going over a hill.

I have ran out ideas now, so any help or a point in the direction would be much appreciated.

P.S, I'm 300 pounds out of pocket now - reluctant to spend anymore on trial and error fixes.

Cheers
 

·
Registered
Joined
·
32,567 Posts
£95 for a boost control solenoid?! :eek:

I think I paid about £35 for one from my local Vauxhall dealer.

That said, it didn't cure the issue I had. Quite a few people with the P0234 code have fixed it with this though...

I had a problem on mine where I'd get this code when I hit 4k RPM in 4th... and more recently found out it does it at 3.5k RPM in 6th too... I replaced some of the vacuum hoses on top of the engine and the boost control solenoid you linked to. I cleaned the MAP sensor, broke it and then replaced it... and the issue just seemed to go away. Soon found the EGR cooler pipe had sheared in half and leaked all the boost into the engine bay, so I think that instead of the issue having gone away, there just was no pressure in the first place, so the sensors knew no better... Since having that pipe replaced, it has started doing it again and it is doing my nut in as I have to be so careful when giving it the beans now. :(
 

·
Registered
Joined
·
8 Posts
Discussion Starter #4
Yeah £95 mate, Vauxhall were quoting £120+!

well i'm taking it back into my mechanic in the morning.. I think he's running out of ideas now too. Shall i suggest checking the vacuum hoses for any leaks? I'm guessing he's already done this.

What's made me wonder is why the EML comes on sooner now i've had the boost control solenoid fitted? Does that indicate that the issue may be related to that area somewhere?

Any further advice would be great.. My knowledge of cars is shocking!

Cheers
 

·
Registered
Joined
·
8 Posts
Discussion Starter #5
Also forgot to mention, my mechanic says there is a hole in the intercooler.. Could that be causing it?
 

·
Registered
Joined
·
8 Posts
Discussion Starter #7
Yeah, he just said because it's overboosting (negative deviation) he doesn't think the intercooler would be causing that. Don't know if that's right..?

Can holes in the intercooler be repaired or would it require a whole new one? :eek: This trial and error is BS!
 

·
Premium Member
Joined
·
2,485 Posts
Boost pressure negative deviation means you car is boosting too much and is normally caused by a siezed wastegate on the turbo. Easy way to check is get your mechanic to disconnect the vacuum pipe off the wastegate and attach a mitie vac to the dyaphram to make sure the wastegate is moving freely. If not its new turbo time I'm afraid
 

·
Premium Member
Joined
·
2,485 Posts
Wouldn't cause a car to over post but you will still need a new intercooler but 1.7s are proven to siezed turbos
 

·
Premium Member
Joined
·
1,746 Posts
I have the same issue although now when I floor it my car smokes badly and then the fuel gauge will go down a bit so
It is drinking like a 3 litre jag!
 

·
Registered
Joined
·
8 Posts
Discussion Starter #12
It's horrible mate. Can't drive it anywhere long distance. No point taking it to Vauxhall, cause I doubt they'd be able to find the definite problem either, unless they spent hours diagnosing it at an insane hourly rate.

Have you done anything about yours?
 

·
Premium Member
Joined
·
1,746 Posts
I change the boost pressure sensor and the light hardly comes on now, the old one was twice as heavy with all the carbon in it!
 

·
Registered
Joined
·
8 Posts
Discussion Starter #16
Left it with my mechanic on Friday. Picked it up in the evening, drove it a couple of times down the bypass since and all seems good so far :)

The whistling/blowing noise that was coming from the turbo before has also disappeared. I asked him what he did, and he said "Did something with the wastegate, changed a couple of the hose pipes, sprayed something in the turbo to clean it out"... Apologies if it's not described very well!

He only charged me £20, so I hope it's done the job! If only this was done weeks ago, would of saved me £290 :|
 
1 - 20 of 22 Posts
Top