Bosch efi specialist needed?.

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rutter123
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Bosch efi specialist needed?.

Post by rutter123 » Tue Jul 08, 2014 3:25 pm

Need someone with Bosch efi experience to come and sort my gti 8v, can anyone recommend a mobile unit near Heathrow, i have tried Boxer motor works and a local Alfa specialist and they are not interested, i'm at my wits end with this problem child bx, i have done what i can to resolve some running issues but cant get the heart of the problem.
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MULLEY
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Re: Bosch efi specialist needed?.

Post by MULLEY » Tue Jul 08, 2014 3:45 pm

Is it an ecu issue you've got? or did you want to try & borrow one to see if that cures the problem? (i haven't got one just incase you ask).
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Re: Bosch efi specialist needed?.

Post by mds141 » Tue Jul 08, 2014 10:16 pm

Might be worth trying an independent VW specialist. The earlier VW's used Bosch before switching to Digifant.
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rutter123
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Re: Bosch efi specialist needed?.

Post by rutter123 » Wed Jul 09, 2014 10:24 am

Thats why i tried the Alfa Romeo specialists as they use the Le1 set up from cars of same era, it needs to go on an oscilloscope or something, it could well be an ecu issue but finding a replacement is a needle in a haystack.
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Re: Bosch efi specialist needed?.

Post by Tim Leech » Wed Jul 09, 2014 4:34 pm

Theres half a dozen BX GTi's being broken at Alan Goodyears place.
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Kitch
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Re: Bosch efi specialist needed?.

Post by Kitch » Wed Jul 09, 2014 7:01 pm

What's up with it?
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rutter123
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Re: Bosch efi specialist needed?.

Post by rutter123 » Wed Jul 09, 2014 8:44 pm

The prob is with lower rpm range between 1500-3000 still got misfire, engine lurching, hesitation, idling issues, very rich on the exhaust? Above 3k is fine, have changed plugs (bosch), leads (bougicord), cap & arm, king lead, tps, temp sensor ok, head gasket done and valves lapped, good comp @ 175 on all 4, timing set @ 5 btdc, injectors asnu cleaned and serviced, fuel pump/pressure good @ 35psi, new fuel lines front to rear and new filter, i suspect the prob lies somewhere in the airflow meter/ecu, almost as if the injector opening timing is not increasing with the opening of the flap?
L
90 BX Tzd turbo 294k SORN undergoing major surgery
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65 Peugeot Boxer Van the new workhorse
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Kitch
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Re: Bosch efi specialist needed?.

Post by Kitch » Wed Jul 09, 2014 9:41 pm

rutter123 wrote:The prob is with lower rpm range between 1500-3000 still got misfire, engine lurching, hesitation, idling issues, very rich on the exhaust? Above 3k is fine, have changed plugs (bosch), leads (bougicord), cap & arm, king lead, tps, temp sensor ok, head gasket done and valves lapped, good comp @ 175 on all 4, timing set @ 5 btdc, injectors asnu cleaned and serviced, fuel pump/pressure good @ 35psi, new fuel lines front to rear and new filter, i suspect the prob lies somewhere in the airflow meter/ecu, almost as if the injector opening timing is not increasing with the opening of the flap?
L
I was about to say sounds like air flow meter :lol:
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Re: Bosch efi specialist needed?.

Post by sdelasal » Wed Jul 09, 2014 9:56 pm

Excessive vacuum leak => resulting in misfire & unburnt fuel => giving impression of running rich? At higher RPM, vacuum leak becomes less important as throttle is more open & intake manifold pressure rises. I have an old 8" vacuum gauge which according to the instruction sheet enables one to diagnose all kinds of running issues. PM me if you want to borrow it. Steve

rutter123
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Re: Bosch efi specialist needed?.

Post by rutter123 » Wed Jul 09, 2014 11:22 pm

There are only 2 vacuums 1 on the diz to throttle body which has been replaced, other to fuel pressure reg which has also been replaced, fuel pr.reg also working correctly, also made some gaskets to seal suspect leaky inlet manifold, as far as i know there are no airleaks pre airflow meter, even blanked off the S.a.d ( choke valve) to eliminate this.
90 BX Tzd turbo 294k SORN undergoing major surgery
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability

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Way2go
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Re: Bosch efi specialist needed?.

Post by Way2go » Thu Jul 10, 2014 2:07 am

Is the second throttle butterfly behaving itself? If the shaft has become corroded and is not rotating smoothly under airflow and its light spring pressure, it may be holding closed too long until the extra draught of the higher rpm.
1991 BX19GTi Auto

rutter123
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Re: Bosch efi specialist needed?.

Post by rutter123 » Thu Jul 10, 2014 7:34 pm

The throttle body and all its components are working correctly, cleaning the body seemed to make the idle a bit more steady, there is def a big flat spot and troublesome area between 2/3k.
90 BX Tzd turbo 294k SORN undergoing major surgery
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability

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Re: Bosch efi specialist needed?.

Post by Way2go » Thu Jul 10, 2014 7:48 pm

Try taking off the air duct and lubricating the butterfly shaft either side with 3-in-1 penetrating oil. As well as lubricating, this seems to deal well with removing any corrosion which may cause flat spots in its rotation.
1991 BX19GTi Auto

rutter123
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Re: Bosch efi specialist needed?.

Post by rutter123 » Thu Jul 10, 2014 9:12 pm

Tim Leech wrote:Theres half a dozen BX GTi's being broken at Alan Goodyears place.
Alan goodyear? More info please.
90 BX Tzd turbo 294k SORN undergoing major surgery
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability

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Jaba
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Re: Bosch efi specialist needed?.

Post by Jaba » Fri Jul 11, 2014 6:50 am

If you can't find an airflow meter replacement then I think I may have one but its off a cat fitted GTi. I dont know if its a direct replacement.
Other options :
There must be a diagnostic somewhere to enable you to check the output from the carbon track on the FM. These are known to wear.
Convert it to Motronic from a breaker. You will need the engine and ECU loom as well as all the engine bits. This system has no distributor which is a definite advantage.
I cant see mention of swapping HT coil, ignition module or in desperation the distributor.These are all worth a try.
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