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Model specific boards => Golf mk4 => Topic started by: Alan16ac on 18 January 2012, 21:14

Title: Boost Problems.
Post by: Alan16ac on 18 January 2012, 21:14

My car holds boost at 12 PSI upto 4300 RPM, when I pass 4300 RPM, it suddenly drops with a jerk of the car to around 7 or 8, it then judders around up and down between 7 and 9 as if it's trying to pressurise but can't hold it's boost?

Any ideas why this could be?
It's got a blow off valve which was on it when I bought it, could this be a problem?

Title: Re: Boost Problems.
Post by: Wazzzer on 18 January 2012, 21:26

what engine code? Most don't like blow off valves...

Title: Re: Boost Problems.
Post by: Wayne on 18 January 2012, 21:28

I suspect the blow off valve is causing it to drop into limp mode.

Title: Re: Boost Problems.
Post by: Alan16ac on 18 January 2012, 21:32

It's a 1999 AGU.
It doesn't stop me from revving all the way to the red line though, which I thought limp mode did?
I don't rev to the redline though as there's no power after 4300, as there's no boost!

Title: Re: Boost Problems.
Post by: daz veedub on 18 January 2012, 21:35

have u checked boost pipes for leaks

ran a faultcode reader ?

ditch the blow off  :wink:

get forge/awesome 007p  :smiley:

Title: Re: Boost Problems.
Post by: Alan16ac on 18 January 2012, 21:51

Quote from: daz veedub on 18 January 2012, 21:35

have u checked boost pipes for leaks

ran a faultcode reader ?

ditch the blow off  :wink:

get forge/awesome 007p  :smiley:

How easy will it be to swap the BOV for the Forge 007p?

I'll run the OBD reader on it tomorrow, only a cheapy that tells me codes though.

Title: Re: Boost Problems.
Post by: Alan16ac on 20 January 2012, 21:40

Here are the fault codes on my OBD reader;
16518
16519
16487
16706
Gonna try and find what they are!

Title: Re: Boost Problems.
Post by: Alan16ac on 20 January 2012, 21:44

Quote from: Alan16ac on 20 January 2012, 21:40

Here are the fault codes on my OBD reader;
16518
16519
16487
16706
Gonna try and find what they are!

16518 P0134 O2 Sensor Circ.,Bank1-Sensor1 No Activity Detected

16519 P0135 O2 Sensor Heater Circ.,Bank1-Sensor1 Malfunction

16487 P0103 Mass or Volume Air Flow Circ High Input

16706 P0322 Ign./Distributor Eng.Speed Inp.Circ No Signal - think this one means the crank sensor which is sorted.

Title: Re: Boost Problems.
Post by: james2 on 20 January 2012, 21:51

Could just be the wrong spring in the blow off valve. I had no problems with a blow off valve on a AGU. I had no fault codes ,even when standard dv died and stayed shut. You will need to sort them codes out after you sort your boost pipes out and replace blow off valve with a 007 .Then delete the codes and see what ones pop back up.

Title: Re: Boost Problems.
Post by: Alan16ac on 20 January 2012, 21:54

Quote from: james2 on 20 January 2012, 21:51

Could just be the wrong spring in the blow off valve. I had no problems with a blow off valve on a AGU. I had no fault codes ,even when standard dv died and stayed shut. You will need to sort them codes out after you sort your boost pipes out and replace blow off valve with a 007 .Then delete the codes and see what ones pop back up.

I think the 1st 2 codes maybe because of it's "special cat"  :rolleyes: