2.0 8v MP9 Revs not picking up

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blou_poot
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2.0 8v MP9 Revs not picking up

Post by blou_poot »

Hi All,

I have tried searching on the forum and the web for an answer but unable to find the correct one.

Few weeks back i went racing on our local track in Namibia.

At about the 3rd run the car just died at launch. Restart the car and starts fine on the key.

But as soon as you give it gas it feels like the car "pulls timing" or "rev limiting" at +-1000 RPM.

the car does not pick up revs at all. Sometimes it would run fine if you give it slight throttle, but this is an art. The car came alive while driving with the "miss" and at about 2000RPM it was happy and suddenly all was well. Seems it might have gone into limp mode or similar.

hope the above makes sense as i usually write the way i think.

What i have done:

* Scanned with VCDS no errors
* TB adaptation
* Fitted new plugs (bosch WD6 i believe i usually run the NGK Bpr6es -zn )
* Rechecked timing
* Tested spark
* tested fuelling
* replaced Fuel relay



To Do today:
* double check dizzy rotor might be 180 deg out - However not sure how this could happen as i was racing with it.
* Source dizzy and Coil and test one by one.
* Change map sensor if i can find my spare
* Change Water Temp Sender.

The problem is the car starts first time and idles fine, as soon as you throttle it it seems as if it splutters.
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Re: 2.0 8v MP9 Revs not picking up

Post by panic-mechanic »

Check the fuel rail. They break inside. Bam , no pressure.
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Re: 2.0 8v MP9 Revs not picking up

Post by blou_poot »

Hi Panic,

thanks for the feedback.

Please advise if the car would intermittently work fine if the fuel rail is broken, should this not be a case of the car not running well the whole time?

Will fit aftermarket FPR to check, please advise if we need to remove old/OEM FPR or should this be fine?
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Re: 2.0 8v MP9 Revs not picking up

Post by panic-mechanic »

Take a screwdriver or a long nose plier in your leading hand. Walk to the car, open the bonnet. Look for the fuel pressure regulator.
Use the screwdriver or plier and pull the circlip that holds the FRP in place out.
Now pull the fpr. If it is broken the centre pipe will come out. If not it is not broken.
Stephan van Tonder - Jhb - Putfontein Benoni
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Re: 2.0 8v MP9 Revs not picking up

Post by blou_poot »

Thanks panic.

Will do so tonight.

Will be providing feedback.

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Re: 2.0 8v MP9 Revs not picking up

Post by UDC »

could also be cracked and hence you loosing fuel pressure, try clamping/crimping the return line and see if it helps.
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Re: 2.0 8v MP9 Revs not picking up

Post by blou_poot »

Hi UDC,

Not sure if I am losing fuel pressure.

last time i crimped the return the motor died/wanted to die... but will definitely have a look.
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Re: 2.0 8v MP9 Revs not picking up

Post by UDC »

fit fuel pressure gauge and check, must have a steady 3bar pressure for mp9
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Re: 2.0 8v MP9 Revs not picking up

Post by blou_poot »

Noted. I only have a aftermarket FPR.

Will fit and see, just hate the damn thing because it makes the car run funny... Probably due to me never fitting a vacuum hose.

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Re: 2.0 8v MP9 Revs not picking up

Post by blou_poot »

Defintely fuel pressure related.

Plugged on the FPR to test... Seems it starts running at 2 bar... Ran pump straight from battery with the same issue so cant be the relay?

This is a bosch fuel pump, can i just clean it as it has the mesh on the inlet side? Or is the pump messed up?

I have been running through pumps past two years, is this because of the fi petrol tank? Or would something else be killing pumps?

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Re: 2.0 8v MP9 Revs not picking up

Post by panic-mechanic »

Put an inline filter before the pump. It is dirt that kills it.
You running straiht petrol? Not some funky mix of chemicals with it?
Stephan van Tonder - Jhb - Putfontein Benoni
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Re: 2.0 8v MP9 Revs not picking up

Post by blou_poot »

Thanks panic,

Will source a filter once i have money for the new pump. These 044 bosch pumps dont come cheap here in namibia. Perhaps our petrol is messed up.

While busy trying to find a solution does anyone know what might have worked for this person: http://www.vwclub.co.za/forum/viewtopic.php?t=203980

Seems hes problem is sorted and seems similar.

The pump runs fine until you hear the pump straining, and thats when fp drops?

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Re: 2.0 8v MP9 Revs not picking up

Post by Dman97 »

Hey guys, sorry to hijack this post. I recently removed dictator from my mk3 Cli and went mp9. My car is having a similar issue. Starts up and idles 100% but doesn't Rev. I have 2.0 map loaded on the ecu, very neat and well done harness, fuel pressure seems fine as car revs isn't jumping and it's quite consistant throigjout the idle. My problem is, she ain't revving up for ****. I suspect map sensor? Anywhere else I can scratch? Thanks guys
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Re: 2.0 8v MP9 Revs not picking up

Post by Dman97 »

Might I add, car is at a friend of mine now and he is always working on mp9 cars so he took the 1800mp9 box from his dad's car and plugged it into mine, same thing, no revving, idles but doesn't Rev. So that tells me that the box is fine, but something somewhere is not giving a signal.
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Re: 2.0 8v MP9 Revs not picking up

Post by UDC »

Try unplugging the map sensor and see if it revs up, if not then test fuel pressure and supply to the rail, pressure needs to be 3bar
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Re: 2.0 8v MP9 Revs not picking up

Post by blou_poot »

Crimp the return line on the fuel rail... If it revs up it would be the fpr/fuel rail that's stuffed... Swop out for new one and you should be good to go... Any pump noise?
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Re: 2.0 8v MP9 Revs not picking up

Post by Dman97 »

Okay guys so update, I tried what yol said here to no avail. So I'm going to try be a bit more specific. Car idles fine, 100%. But as soon as I Rev the car, it's as if it smothers and wants to die. Just bear in mind, this car had no previous issues before the conversion besides idle issues due to the dictator always messing with that. Something tells me the injectors aren't getting propper signal, maybe we should have a look at this harness again to make sure everything is 100%. What can I check for?
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Re: 2.0 8v MP9 Revs not picking up

Post by UDC »

did you run diagnostics and see what codes come up, check fuel pressure to see what the pump is providing
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Re: 2.0 8v MP9 Revs not picking up

Post by Dman97 »

Sooo I was right, it was the harness. I bought the harness from a guy that said it came directly off mk3 jetta. So I assumed everything was there but I missed the relay and fuse. Attached that and car is starting fine now and revving up. Yerrr, mp9 sounds and idle's beautifully compared to digifant on dictator. Fully recommend this rather than dictator for a standard motor.
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Re: 2.0 8v MP9 Revs not picking up

Post by blou_poot »

Yip mp9 for a standard motor is nice. But dicktator is great especially if you have the right tuner. Or the right guys to assist.
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Re: 2.0 8v MP9 Revs not picking up

Post by Dman97 »

Dictator isn't the best down here in PE. I suppose inland maybe yes. I always had to take the car for a tune if I do the slightest change. I had a good tuner, probably one of the best, Nazeem from nisma performance. But sad I'm going to have reduced power now, we managed to fish out 91kw on the stock 8v motor. I'm assuming I will only get around 88kw now. Also going for tune everytime isn't cheap. It's fine if you a racer and prepared to spend the money.
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Re: 2.0 8v MP9 Revs not picking up

Post by Dman97 »

Hey guys, me again, so driving the car now for few weeks with the mp9 set up, runs awesome. However, apparently the cold start on these things are supposed to be pretty great, however, mine doesn't kick in until I'm actually out the yard and driving to the first stop street lol. When I get there and stop, then it idles over 1k revs as cold start should then levels out late to 900-950 which is 100's. However, if I'm in the yard on first start, it starts up but cold start doesn't kick in immediately,it idles at 850-900 then maxes out at 900. Maybe water temp sensor or anything else to look at? Shot guys, any feedback is appreciated 👌💯
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Re: 2.0 8v MP9 Revs not picking up

Post by UDC »

Most likely the water temp sensor as that tells the Ecu if motor is cold and to compensate the fueling accordingly
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Re: 2.0 8v MP9 Revs not picking up

Post by Dman97 »

Okay thanks UDC will change that out. I'm using the green/yellowish one by Hella at the moment. Any recommendations or should I just pick up the same one? Because the guy at midas told me last time that they sell many of those with no issue. There was a more exoensive one but not sure of the name, I think FAE.
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Re: 2.0 8v MP9 Revs not picking up

Post by Mona3636 »

What relay and fuse are u talking about.
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