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Guest Message by DevFuse
 

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any mk2 polo sniffers in here?


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7 replies to this topic

#1 OFFLINE   steveo3002

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Posted 11 July 2018 - 11:17 AM

fitted mpi fuel inj from a mk2f into my mk2 , cant seem to get it sorted



suffers from a bad idle,bit bumpy pop pop sound and refuses to start hot - between 3-20 mins , will start with bts undone , drives fairly okay above idle 

a few things ive tried /done

timing set as per the book 
air bypass mixtured tired various settings ...its set to 14.1 afr via a wideband gauge at the moment
tried another dizzy /cap/arm
tried another coil
correct plugs fitted
earths good
tried another tps
no obvious air leaks + charcoal can deleted
correct 3 bar pump fitted
new genuine blue sender plus tried others i had laying around 
spare set of used inj tried with new o rings
spare afm tried 
blocked the isv at the tb elbow- no change in running

engine basics should be fine as ive had the car driving for 2 years on a carb ..ive not touched the internals since

has crude diagnostics , no codes showing

still waiting on a ecu to try...them im pretty much out of ideas , anyone localish to cambridge that knows these , or a garage that remembers old cars , none of the garages ive spoke to have any ideas and dont really work on old toot

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#2 OFFLINE   Parky

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Posted 11 July 2018 - 12:56 PM

Might be worth asking pauldoubleyou.

He seems to be a bit of a VW whiz, have a look at his 20v engine into a Lupo thread

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#3 OFFLINE   4wheeledstool

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Posted 11 July 2018 - 06:00 PM

Might be worth testing the wires from the temp sender to the ecu. One of my Polos displayed the same symptoms about 10 years ago - one of the pins in the blue temp sender plug was seriously corroded causing a duff signal.

#4 OFFLINE   steveo3002

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Posted 11 July 2018 - 06:41 PM

Might be worth testing the wires from the temp sender to the ecu. One of my Polos displayed the same symptoms about 10 years ago - one of the pins in the blue temp sender plug was seriously corroded causing a duff signal.

 

yeah it kinda points toward it 

 

diag live data shows accurate reading from it though , and ive used the multimeter to "beep" its continuity and wiggled it and its checking out ...guess it might be worth running a new wire

 

can you describe more on what happened with yours ...im really struggling here

 

thanks



#5 OFFLINE   steveo3002

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Posted 12 July 2018 - 03:07 PM

right 

 

add to the list tried spare ecu , tb and fpr - no change 

 

also ran fresh wires from blue sender all the way to ecu..nothing 

 

o2 sensor fitted too



#6 OFFLINE   4wheeledstool

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Posted 12 July 2018 - 03:11 PM

yeah it kinda points toward it

diag live data shows accurate reading from it though , and ive used the multimeter to "beep" its continuity and wiggled it and its checking out ...guess it might be worth running a new wire

can you describe more on what happened with yours ...im really struggling here

Mine was just running over rich with a lumpy idle - to start it when hot needed the throttle wide open.

#7 OFFLINE   steveo3002

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Posted 12 July 2018 - 03:14 PM

sounds similar ...no amount of pedal will get mine going when hot



#8 OFFLINE   4wheeledstool

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Posted 12 July 2018 - 03:23 PM

In my case the charger provided a small amount of boost when cranked with the throttle wide open - the extra air must have helped start it?




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