citi rox power issue

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Dj lost
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citi rox power issue

Post by Dj lost »

have an issue on a 09 rox 1.6i,

Its sometimes runs fine, but most the time its in a sort of limp mode, where it can only rev to 4800rpm, it loses power from 3000 - 4800rpm, doesn't rev up quick,

Checked fault codes, only one was lambda,

Replaced lambda, still the same,
Replaced Distributor
Replaced map sensor
Replaced Coil
Replaced fuel - to rule out bad fuel...
Water temp sensor reads normal on vcds and cluster
Cleaned throttle body
Confirmed Mechanical timing, found it 1 tooth out, rectified.
Replaced sparkplugs
fuel pressure checked
Did CR test 190PSI on all 4 cylinders

Now if I do something, and test drive it seems to come right, then if I can just recycle the power, then its in limp.
Then starting in morning is a pain, it swings, with spark but no start. and after some swinging it comes alive and sounds like its got a larger cam, lumpy idle, wont rev up, sounds like a carb golf with choke open, when you try rev it, then it clears up and acts normal.

Could ECU be bad?
Knock sensor?
TPS?

As the motor is good, but it doesn't behave when in limp, but when it not in limp then it is just like any other good 1.6i
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Re: citi rox power issue

Post by Unobeat »

Dj lost wrote: Now if I do something, and test drive it seems to come right, then if I can just recycle the power, then its in limp.
Then starting in morning is a pain, it swings, with spark but no start. and after some swinging it comes alive and sounds like its got a larger cam, lumpy idle, wont rev up, sounds like a carb golf with choke open, when you try rev it, then it clears up and acts normal.

Mmmmh, why dont you rather change the temp sensor?
does is splutter while it is idling or any misfiring at all?
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Re: citi rox power issue

Post by Dj lost »

Took it to a local dyno, and the issue can be seen as overfueling, it comes down to 9:1 afr when reving,
at idle around 11:1
Now the lambda was changed, but it still does it,
Im removing the ecu now to send in for testing,
Just removing is not an easy job so far...
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Re: citi rox power issue

Post by bru-tom »

i had the same issue, I put an ABF in mine :moon:

sorry, back to topic.... :hug:
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Re: citi rox power issue

Post by missioner »

Shurlok MPi injection?

If yes then chuck it out. Klaar.
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Re: citi rox power issue

Post by panic-mechanic »

I have seen that exact problem from mpi twice in the last 3 months. You can do what you want you can't change that fuelling.
I changed every sensor and it would not come right. Fixed it by removing the stupid thing and installing aftermarket on the one car and onnthe other car the guy decided rather to buy another car.
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Re: citi rox power issue

Post by -=sT3V3=- »

is it not something simple like a cracked fuel rail??

lol @ " guy decided rather to buy another car."
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Re: citi rox power issue

Post by THANAS »

Cracked fuel rail = Very low fuel pressure, not overfuelling.
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Re: citi rox power issue

Post by missioner »

THANAS wrote:Cracked fuel rail = Very low fuel pressure, not overfuelling.
+1

Only way a car can over fuel without ECU being faulty is if the fuel pressure regulator is fully open and not working properly. Even then a system with lambda correction would trim for this to some degree, making it hardly noticeable other than if you measure your consumption.

All the knowledge I have gained with regards to the Shurlok MPi ECU is that it is not built to last, or be modified.

If you are in or near the East Rand go see our good pal here Mr P. Mechanic. Fixed up.
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Re: citi rox power issue

Post by panic-mechanic »

I tell you I tried everything. Fuel pressure all sensors, name it. Even if younfiddle with it's adaptation that is supposed to set the fuel baseline it does NOTHING. Just overfuels and that is that.
If I disliked mp9 then i actively hate mpi.
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Re: citi rox power issue

Post by Dj lost »

Well thanks for the replies.

This is what I suspected but was looking for closure as the car was sent to me by a dealership, and its the first time I feel clueless on the simplest of cars. a citi golf.

I did suspect ecu, ive removed and sent it in for test/repair. as I had no other thing to test or swap out, to get the fueling normal.

MP9 seems much more reliable opposed to this MPI junk. I had another MPI a year or so ago revving to 5k. but when removing the chip (bridge plug) it would then rev as normal. so I suspected it would need to be retuned. But in this case I couldn't put a bridge plug as there is no chip.

Thanks again for all the replies
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Re: citi rox power issue

Post by panic-mechanic »

If it is any consolation after the first one I also felt the same. I fiddled with the thing for 2 weeks and I didn't even charge the guy despite him insisting on paying something. I could not change a thing to what it was doing and I felt totally useless.
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Re: citi rox power issue

Post by Jacques1397 »

Dont know if its related or not. Changed my back box to free flow and started having the following issues - stop at a light car doenst idle more that 20 seconds then dies. Checked error codes. Lambda sensor faulty. Replace that. Same story.

Took it to VW - they said it needs a new computer box

covered under warranty and replaced. Problem seems resolved

Mine is 2008 Citi Rox 1.4i
Current :
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Ex :
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Re: citi rox power issue

Post by Rourke »

If this is resolved then ok but if not sorry for the hijack

I would just like to know on what cars did the MP9 come out on and how do u identify it?

on What cars did this MPI come out on and how do u identify this.

Reason for me asking is. I had a 2005 Velo that I built up ,but I bought a engine somewhere els. Bought a temp sensor straight from vw.
Then got this car to start but they lost the keys so wat I did was get a ECU which the guys out there call a magic box.

We started the car . And it had a rough idle as well as spluttering at idle. This car had a 4-1 branch and pulled nicely from 2000revs.

Wen revving it was making black smoke.

I went to some1 he found a racing cam there so we swapped it out for a std 1. Rough idle was better but still spluttering and then swapped out the map sensor. With this sensor no matter how u drive city or long it gave 10l/100kms.

It was over fueling and then I thought its that magic ECU I had in.

So now im curious about wat system that car used as I never seen a lambda plug anywhere.

Thanks
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Re: citi rox power issue

Post by Torker »

2005 Velo = MP9...
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Re: citi rox power issue

Post by Dj lost »

To me its only when they brought out these series

Rox
Citi Sport
GTS
MK1

The velos, .com citi 1.4i 1.6i etc was still the mp9.
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Re: citi rox power issue

Post by Torker »

Dj lost wrote:To me its only when they brought out these series

Rox
Citi Sport
GTS
MK1

The velos, .com citi 1.4i 1.6i etc was still the mp9.
My '08 Citi Storm also got MPi but not for long, the Dicktator is ready to go in (when I start modding the car)
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Re: citi rox power issue

Post by Rourke »

What did the golf 3 and polos use?
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Re: citi rox power issue

Post by panic-mechanic »

Year dependent but mp9 mostly. Very early gti3 was diigifant.
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Re: citi rox power issue

Post by Dj lost »

panic-mechanic wrote:If it is any consolation after the first one I also felt the same. I fiddled with the thing for 2 weeks and I didn't even charge the guy despite him insisting on paying something. I could not change a thing to what it was doing and I felt totally useless.
That makes me feel a bit better, as I am in the same boat. spend so much time, and it does nothing, also cant charge for all the time literally wasted on it, as there is no results to show for it.

Closure. Thanks Panic,
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Re: citi rox power issue

Post by duple07 »

Hi All

Hope I can get a reply.

I purchased an MK1 and lets say I was hoping for less hasles but sofar this MPI system is causing endless problems. I had an revving and misfire issue then the problems started:
1st the fuel pressure regulator wasn't working and we replaced it due to it letting 6 bar of fuel through to the injectors
Then the Lambda sensor showed an error and we replaced that
Still after all this including a major service this MK1 just feels slow it starts with a misfire when cold and lacks acceleration

Any ideas what this can be? My parts bill on the motor is huge however I want an authentic MK1
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Re: citi rox power issue

Post by duple07 »

Ohh to add to this we also replaced all the sparkplugs, and we replaced the complete distributor with an OEM one

Feeling a bit clueless on what it can be. injectors at VW is 2700 x 1!
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Re: citi rox power issue

Post by missioner »

duple07 wrote:Ohh to add to this we also replaced all the sparkplugs, and we replaced the complete distributor with an OEM one

Feeling a bit clueless on what it can be. injectors at VW is 2700 x 1!
I really doubt injectors will solve your problem.

Check the basics again. Compression test, timing-cambelt and distributor static timing. Pressure test cooling system and do a block test to determine if combustion gas is present in the radiator/cooling system.

I know these test may seem redundant, but I personally have been stumped by a number of vehicles that it eventually turns out to have had simple problems with complex symptoms.

Also get a second opinion.
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Re: citi rox power issue

Post by Edward ryan governor »

Late 2008 storm is also 1.4i I am the fist owner but damn I'm dik of this issue already I replaced cpu lambda temp switch knock sensor map sensor fpr valve fuel rail and even to throttle body everything was bought from vw even had the motor opened by vw to check maybe if it was a valve dropped or something **** al I'm now thinking of just throwing out that ecu and going for cpi or aftermarket but this sherlock seems to be lot of issues not even vw can fix
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