gti 8v not starting

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gti 8v not starting bloody hate petrols

Post by rutter123 »

all re-assembled, still no go, will fire up on damp start only, have checked the injectors for power and they appear dead, does the engine need to be in the cranking pos to power up the inj or should they power up with the fuel pump with ign on? the fuel pump is running and pressuring the spray bar sufficiently but still goes no further than that, all i get at the injectors is a floating voltage on one side of 0.1v, i beleive the injectors are controlled by a relay which is mounted by the battery, there are 4 there but which one? i have posted up a pic if anyone can spot any obvious mistakes. there is a spare lead with a terminal on it on the coil lead but this was not connected to anything before.
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Re: gti 8v not starting bloody hate petrols

Post by sdelasal »

I think your car has the bosch motronic 1.1 maybe 1.3. There is plenty of good fault finding info on the web. Essentially though, the ECU will ground the injectors when it wants them to open. If yours are not then it suggests they are not getting supply power - wiring fault, relay fault. Take a look here, for example, http://www.hiperformancestore.com/Motronic.htm" onclick="window.open(this.href);return false; where some relevant fault finding info can be found in steps 4 & 5. The info is actually describing a BMW application but the bosch engine controls are electrically identical. Good luck! Steve
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Re: gti 8v not starting bloody hate petrols

Post by rutter123 »

thanx for that steve i have had a read up and to be honest its all well out of my mechanical knowhow, i can check the basics but there is definately no power at the injectors i have checked the op of the injector relay and its ok. looks as if this is now becoming a mystery and will prob be a very expensive one as im at a loss now and will have to leave it to someone in the know. i suspect its an ecu issue.
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Re: gti 8v not starting bloody hate petrols

Post by rutter123 »

have now got power to the injectors, showing 12v when the fuel pump primes up then shutting off, then showing 12v when cranking the engine, think this was down to a faulty relay, but still not starting.
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Re: gti 8v not starting bloody hate petrols

Post by rutter123 »

have just noticed a blown fuse in the under dash fuse box 7th fuse from left 30A, dont know what this fuse protects as all the wiring diagrams i have are different, have changed it but still not starting, now fed up and out of enthusiasm hoping someone can shed some light. what started out as a 1hr job has now turned into a big 2 day headache.
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Re: gti 8v not starting bloody hate petrols

Post by Kitch »

If its Motronic it'll probably have a crank sensor. If that's died the injectors won't know when to fire. As mentioned there is shit loads of diagnostics info on the web. Grab a multimeter and start at the beginning!
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Re: gti 8v not starting bloody hate petrols

Post by Tinkley »

Don't forget to check any earth straps on the system. A bit of a long shot but repainting a 'ground' area (effectively isolating it) can prevent a good earth contact. Once I had a m/c frame respayed and the biggest headache was getting all the electrical system sto work - because some of it was not grounded due to the new paint.
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Re: gti 8v not starting bloody hate petrols

Post by Jaba »

What about the spark ?? If none then possibilities are: broken wiring, ignition amplifier, dizzy cap, ht coil.....

There is no TDC sensor with this engine so timing has to be set manually.
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Re: gti 8v not starting bloody hate petrols

Post by Kitch »

Jaba wrote:What about the spark ?? If none then possibilities are: broken wiring, ignition amplifier, dizzy cap, ht coil.....

There is no TDC sensor with this engine so timing has to be set manually.
How do the injectors know when to fire?
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Re: gti 8v not starting bloody hate petrols

Post by rutter123 »

its a bosch jetronic 1.3 i believe.
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Re: gti 8v not starting bloody hate petrols

Post by mat_fenwick »

Jetronic doesn't know when the engine is at TDC - the reason I know this is when fitting the 16v (Motronic) engine to an early (Jetronic) 205 which didn't have the TDC sensor mounting on the gearbox. This was a slight ballache after getting the engine and 'box in the car... So I'd assume that the Jetronic system just uses the signal from the distributor to fire the injectors; after all the precise timing doesn't matter as all injectors fire at the same time. So long as it's once per revolution it won't matter.

Not sure why a second thread has been started on the same subject, so I'll try and combine the two (despite drink having been consumed ~wine~ )
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Re: gti 8v not starting

Post by Way2go »

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Looking at your picture, the output air port from the filter/airmeter assembly appears disconnected. The airmeter is an important control signal for the Jetronic ECU system, so I doubt that the engine can run or even idle without it in circuit. :?
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Re: gti 8v not starting

Post by rutter123 »

yes i had to remove it so i could spray dampstart in the throttle body, tried it with the pipe on but made no difference. still no go,
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Re: gti 8v not starting

Post by rutter123 »

as i suspect the ecu may be at fault can i fit an ecu from a pug 205 gti 1.9 ? as i can source one quite locally for not a lot of £'s , is it worth a try ? tho the serial number is different on the ecu will it work or do the serial have to match?
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Re: gti 8v not starting

Post by rutter123 »

how can i "home test" a fuel pressure regulator-vacuum type? bosch 2.5 bar which i believe is about 35psi. as i suspect a fuel supply prob or at worst ecu.
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