Noticed over the last couple of days that when i am in 2nd and put my fut down it starts to come on boost then it stutters and clears, like it holds back for a second, any ideas whats causing it? It only seems to happen in 2nd gear too.

Rich

 

What plugs and gaps are you using ?
tabetha

 

denso ik27's not sure on plug gapth

 

What boost does it do this at?

 

its just around the boost spike, so around 2.1 bar

 

Rich mine has decided to kinda do the same and its pissing me off tbh. The rev counter sometimes just idles funny and goes off the clock when you give it the beans. Sometimes it acts normal but holds back/kinda miss-fires on boost at around 4k.

Am running:

group A coil
ford motorsport (909) leads
denson ik27
Bosch 044 pump (which was re-wired)

the plugs were changed by Karl @ NMS when it was mapped and he said ill never have to mess around with gapping/changing them etc so i haven't bothered replacing them or messing around with gap. Ive inspected them & look okay.

Cleaned out the multi-plugs on the bulk head (prob just go solder them tommarrow if i get time but a bit worried if i fck it up as i dont trust meself)

Changed the rotor arm (should've done the cap but Matts out of stock at the moment)

Put new decent leads in as mentioned above.

Can't think of anything else

Funny thing is car was bang on and we went to Nobles for a rolling road meet with PF about a month ago. Drove up to Chesterfield normally but eversince they've put it on the rollers it miss-fired then and since its come off the rollers.

Kinda pissing me off but luckily ive got an M3 to calm me from the stress of it.

Any other ideas lads, anything at all would help???

cheers

Reiss

 

Rich did you have any joy with this any idea what it can be?

 

not as yet, i am gonna pull the plugs out at the weekend and see how they are, but to be honest it doesnt really feel like a misfire so i am a bit stumped

 

If your rev counter goes skyward and jumps around when you start boosting it points to the engine loom, it can be as simple as the loom plugs but may require a fitting of a new loom, my car had this problem and I took the loom plugs out and soldered the wires up, this lasted for about 16 months but then same problem came back, eventually put a new engine loom in and problem solved


Luciano

 

the rev counter on mine seems to be working fine, it hesitates like the boost does

 

Your rev counter could be the cause, as it is connected to the coil, they can cause the problem you describe, or cut the engine completely, so might be worth just pulling plug at coil and seeing if it still does it.
tabetha

 

i dont understand the rev counter seems to be fine and reflecting the engine speed, when it hesitates on boost, the revs still go up, just much slower in line with the engine speed and also why would it only do it in 2nd?

 

charlie luciano: Ive cleaned out the multi-plugs on the bulkhead and still not joy. They look fine tbh but i cant be arsed to solder them..

Twellsie: did you manange to sort it out, if so what was the problem?

Ive jst parked mine up as its shitty weather and cant be arsed wiv it though i really want it ready for Central Day as i'd like to take it on the 1/4 mile

 

mine has fixed its self, lol doesnt do it anymore

 

Knowing my luck it'll probably go even worse.... Ill wait till the weather clears up a bit and mess around if not think ill have to take it back to Karl. Fricken cossys

 

from my experience, just phone Karl, he will tell you what to do!

 

Similar issue. Replaced the old phase sensor in the distributer and the fuel pressure regulator (must be 3.5 bar). No more issues in my car now.