Citi Golf Sport ( 2008 ) 1.4i jerking problems

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Dwayne303
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Citi Golf Sport ( 2008 ) 1.4i jerking problems

Post by Dwayne303 » Thu Feb 08, 2018 11:00 am

I'm having issues with a Golf1 I bought. Details are:
2008 model Citi Golf Sport 1.4i ( injected MP9 )

The engine / exhaust is completely stock. 137000km an the original head gasket is on. Head has probably never come off.
I'm experiencing very lumpy idle ( not hunting, its just very lumpy ) and also what feels like fuel starvation during hard accelerating. The car jerks and stutters when you doing about 130kph on the freeway. If i tap off a bit it kind of comes right but still feels like there's a niggle?
The problem happens when cold, first start in the morning, and its also happens when hot at "high revs" 5th gear doing 130kph.
Im not wacking the car either, just normal driving and it makes dropping a gear to overtake a nightmare, because the engine feels like its being "starved"

At the current moment Iv tee'd into the fuel lines before the fuel filter so i can monitor fuel pressure, with a fuel pressure gauge, that i routed through the firewall so i can check things while driving.
The fuel pressure is 2.6 bar at idle and when you blip the throttle it jumps to 3.0 bar immediately.
Every time I experience the jerking when driving on the freeway I check the gauge and it remains constant at 3.0 bar. NO fluctuation, which tells me the fuel pressure is good ( but maybe not fuel delivery, who knows ??? )

Iv checked and done the following common things.
Found a hairline crack in my coil. ( replaced with Agents part - they cost a fortune but its worth it )

Had my HT leads ( and coil - they found the crack mentioned earlier ) tested at a Distributor centre in Durban - they still good no faults so still using the original HT leads.

The small rubber pipe from the fuel tank to the fuel pump ( it takes a small radius 90 degree bend ) it was kinked, so I replaced it with a moulded pipe.
While I did this i checked the flow rate from the tank itself and it was very good, no blockage. Also checked the steel gauze filter on the fuel pump itself and it was super clean....the fuel pump also primes when i turn my key so I know the fuel pump relay is grafting.

I found a fuel pipe in the engine bay, that runs into my fuel rail that was cracked, I replaced the fuel pipe and checked all the others, all seems fine.

I checked the rotor in the dizzy, there's no arcing, but i put a new rotor anyway, they cheap enough.

I replaced the water temp sender unit with an AGENTS part to rule that out...

I removed the throttle body and cleaned it with carb cleaner, the butterfly was fine, but i cleaned it anyway. I also made sure the gasket for the throttle body was not damaged, its like a green gasket and it looked in good nic.

Had the car plugged in at a mechanic place, and there were no errors ??? Map sensor gave no error ??? This was really strange to me ???

After doing all this, my golf still jerks and has lumpy idle....I really don't want to sell it, and id feel bad selling it anyway to another bloke without telling him there's a nasty little problem that will come up, id love to fix this but now i'm stumped...Can you guys think of somewhere Im not looking yet...Really appreciate it.
Thanks
Dwayne
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dubz-on-drugz
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Re: Citi Golf Sport ( 2008 ) 1.4i jerking problems

Post by dubz-on-drugz » Fri Feb 23, 2018 7:42 am

Dwayne303 wrote:I'm having issues with a Golf1 I bought. Details are:
2008 model Citi Golf Sport 1.4i ( injected MP9 )

The engine / exhaust is completely stock. 137000km an the original head gasket is on. Head has probably never come off.
I'm experiencing very lumpy idle ( not hunting, its just very lumpy ) and also what feels like fuel starvation during hard accelerating. The car jerks and stutters when you doing about 130kph on the freeway. If i tap off a bit it kind of comes right but still feels like there's a niggle?
The problem happens when cold, first start in the morning, and its also happens when hot at "high revs" 5th gear doing 130kph.
Im not wacking the car either, just normal driving and it makes dropping a gear to overtake a nightmare, because the engine feels like its being "starved"

At the current moment Iv tee'd into the fuel lines before the fuel filter so i can monitor fuel pressure, with a fuel pressure gauge, that i routed through the firewall so i can check things while driving.
The fuel pressure is 2.6 bar at idle and when you blip the throttle it jumps to 3.0 bar immediately.
Every time I experience the jerking when driving on the freeway I check the gauge and it remains constant at 3.0 bar. NO fluctuation, which tells me the fuel pressure is good ( but maybe not fuel delivery, who knows ??? )

Iv checked and done the following common things.
Found a hairline crack in my coil. ( replaced with Agents part - they cost a fortune but its worth it )

Had my HT leads ( and coil - they found the crack mentioned earlier ) tested at a Distributor centre in Durban - they still good no faults so still using the original HT leads.

The small rubber pipe from the fuel tank to the fuel pump ( it takes a small radius 90 degree bend ) it was kinked, so I replaced it with a moulded pipe.
While I did this i checked the flow rate from the tank itself and it was very good, no blockage. Also checked the steel gauze filter on the fuel pump itself and it was super clean....the fuel pump also primes when i turn my key so I know the fuel pump relay is grafting.

I found a fuel pipe in the engine bay, that runs into my fuel rail that was cracked, I replaced the fuel pipe and checked all the others, all seems fine.

I checked the rotor in the dizzy, there's no arcing, but i put a new rotor anyway, they cheap enough.

I replaced the water temp sender unit with an AGENTS part to rule that out...

I removed the throttle body and cleaned it with carb cleaner, the butterfly was fine, but i cleaned it anyway. I also made sure the gasket for the throttle body was not damaged, its like a green gasket and it looked in good nic.

Had the car plugged in at a mechanic place, and there were no errors ??? Map sensor gave no error ??? This was really strange to me ???

After doing all this, my golf still jerks and has lumpy idle....I really don't want to sell it, and id feel bad selling it anyway to another bloke without telling him there's a nasty little problem that will come up, id love to fix this but now i'm stumped...Can you guys think of somewhere Im not looking yet...Really appreciate it.
Thanks
Dwayne
I would say fuel rail .I had similar issue when my fuel rail had a internal leak ...very shortly after .it completely broke and I just fitted a external fpr never had a problem since .

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ADZ
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Re: Citi Golf Sport ( 2008 ) 1.4i jerking problems

Post by ADZ » Fri Feb 23, 2018 9:38 am

Easiest way is to get it scanned no use spending all the money changing things that doesn't need changing trust me lol had similar issue turned out to be a wire from the map sensor broke and kept touching other stripped wires causing a jerk and stall.

to check if the fuel rail is broken unclip the FPR pull it out if the inside comes out or there's alot of play its stuffed if not then that's not your issue but like i said get it scanned first.

02' citi 2L 8v
89' Mk2 1.8 16v GTi

72' Beetle 1600TP
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Re: Citi Golf Sport ( 2008 ) 1.4i jerking problems

Post by panic-mechanic » Fri Feb 23, 2018 9:48 am

So if you read his whole story younwill see he had it scanned and found no errors.
If the fuel rail was cracked the pressure would have dropped.
Gomsee the vcds guy again and look at th values of the manifold pressurensensor and the throttle body, not just scan for faults.
Stephan van Tonder - Jhb - Putfontein Benoni
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ADZ
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Re: Citi Golf Sport ( 2008 ) 1.4i jerking problems

Post by ADZ » Fri Feb 23, 2018 10:24 am

oh never saw that sorry, well when mine had a similar issue, first time it did not pick up any errors at all but a week later second time we checked it picked up a short to ground error on the map sensor, it was strange I know but what he's describing is quite similar to the issue I had except mine started when it was at normal operating temp. I would suggest clipping off the the map sensor and injectors and have a look a that wiring harness to see if there's any break in the wires just be sure.

02' citi 2L 8v
89' Mk2 1.8 16v GTi

72' Beetle 1600TP
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