I have a my 95 classic and just lately been having trouble with when its on boost it holds back and very hesitant.i done a boost soloniod test by connecting the wires up under the dash and it is clicking.does this mean boost soloniod is ok.also tried cleaning solonoid with carb cleaner and no dirt come out,any aadvice welcome.also bit confused that imgetting speed sensor fault code coming up,would that effect the boost.

 

VTA dump valve fitted?

 

it has a bailey dump valve fitted.and apart from that and exhaust car is standard

 

That would be my first port of call - especially now you've said Baileys. Have you got another VTA or recirc to try on the car?

 

The exhaust been fitted recently? as in has this problem just occured or after it was fitted?

 

I had this on my mates 95 classic yesterday,check engine light flashed up 33,car would drive ok ,till you put your foot down then it went in to 'limp ' mode,it turned out to be the speedo cable not plugged in and the outer cable had split. Sourced another within the hour and car is running fine.Also agree with the above as the baileys dump valve not the best and are prone for weakness,just fitted a std recirc to my mates car after he has a baileys,hks,GFB,and a forge dv in the last 6 months.

 

everything was on car when i got it,the speedo cable was in the back of clocks but clocks are no good,i had a look at the cable and the end of it is snapped,just curious as when i do a ecu reset it will be fine for a little while but when u start boosting it will bring up the fault code and start holding back and kangarooing,i am surprised that it would have this effect bieng down to a broken cable,and i would like to put back the original recirc dump valve on it if i can find one.

 

Ive just had a mare with mine, total ******* to diagnose. Turned out to be the boost solanoid. Easyst way to check is borrow one off a mates car.

 

might try that and see what happens

 

Mine was pulling fine to 4k rpm then dropping about 5psi of boost then fine again to 5k rpm same again then fine to red line.

 

midnight when your mates car cable werent connected was it causing it to hold back on boost,like a kangarooing effect

 

bttt

 

And what caused Ur problem?

 

at a guess sounds like his is boost soloniod

 

A disconnected or broken speedo cable will cause your problems. The ecu will not be recieving any info from the speed sensor and will therefor go into safe mode.

Repair the cable first, before messing with anything else.

 

Replaced boost solanoid and all fine now,

 

im getting a cable this week but need new clocks as mine are broken.

 

Yes mate it did,as posted above the speed sensor could not determine the speed so car went into limp mode every time you booted it. A new cable and car was sorted.

 

when i go to boot the car at low revs it doesnt seem to want to go unless i change down a gear, i thought this was due to abit of turbo lag, somones mentiond to me now about the boost solonoid might hav gona. how can you test this to see if its ok?

 

Boost solenoid can get clogged up, the easiest way to clean it , is to disconnect the pipes on your solenoid and connect the green & black wires together and switch your ignition on. You should hear the boost solenoid clicking , then spray brake cleaner through the top hoses. Simple