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Old February 5th 07, 02:41 PM posted to alt.autos.audi
dave AKA vwdoc1
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Posts: 951
Default '87 Audi 4000s fuel problem - wont start

hmmm
Not to get too picky or exact, but did you perform the tests like I
instructed? :-)
Cranking the engine brings other things that could cause problems such as
the ign switch which could, if faulty, lose power to key components like the
FPR, fuel pump, ign system, etc! Even the power could drop below 10 volts
while you are cranking over the engine.

It sounds like you disconnected the lines to the injectors instead of
removing the injectors.
It sounds like you did not jump the fuel pump relay.

Now if you are getting correct power to the fuel system and ign system, and
you have fuel pressure at the fuel distributor, and you pull up on the fuel
distributor plate while the fuel pump is running and you get no fuel out of
the injectors................................then it sounds like either the
FPR or the Fuel Distributor might be the cause of your problem. But I am
just guessing here since I am not sure if power gets lost to the FPR while
you are cranking over the engine.

Bentley is the better manual and you can find them on Ebay sometimes.

later,
dave
(One out of many daves)



> wrote in message
oups.com...
> On Feb 4, 6:13 pm, "dave AKA vwdoc1" > wrote:
>> Do you have a repair manual? Even a Haynes (cough cough) could help
>> some.
>>
>> Remove intake boot off of fuel distributor so you can manually lift up
>> the
>> plate.
>> Remove injector(s) out of the cylinder head and aim into a container so
>> you
>> can examine spray pattern.
>> Remove fuel pump and jump correct wires to run fuel pump continually.
>> Turn ign on but do not start car.
>>
>> Pull up on fuel distributor plate to check fuel injector spray pattern.
>> Tell us what happens?
>> If it sprays out that is good and you might just need to adjust something
>> or
>> change a sensor.
>> If nothing sprays out then I suspect either a bad fuel distributor, bad
>> Fuel
>> Pressure Regulator, bad wiring, missing fuse, clogged injectors, no fuel
>> pressure or ????
>>
>> The ground wire for the FPR usually breaks at the cold start valve.
>>
>> No the temperature sensor for the gauge is different than the one for the
>> fuel injection. ;-)
>>
>> later,
>> dave
>> (One out of many daves)
>>
>> > wrote in message
>>
>> oups.com...
>>
>>
>>
>> > Hello Audi 4000 fuel help still needed

>>
>> > Been busy at work, not much time to work on the Audi until last week.

>>
>> > Still having problems getting this car to run, was wondering if there
>> > are any other ideas out there?

>>
>> > I still can not get the fuel injector unit to shoot fuel into the
>> > injectors. It still fires fuel to the cold start valve, enough juice
>> > to run 3-5 seconds.

>>
>> > I checked all fuses, put new ones in the blank spaces.

>>
>> > I checked the fuel injector air-door, it opened fine.

>>
>> > I replaced the entire fuel injector unit with a used one I had from a
>> > parts lot I bought.

>>
>> > I changed the fuel regulator as well, the one on the injector unit, I
>> > believe this is the "Differential fuel pressure sensor (just in
>> > front of fuel distributor." ,that you mentioned
>> > As far as the "Failing engine temp senso" " the MFTS ", is this the
>> > same as the temperature sending switch? . Could this really keep the
>> > fuel injector unit from firing? Can I bypass this to test it?
>> > There is no massive air leak at the large intake manifold
>> > The ignition switch is fine, it is new, it is getting power to the
>> > fuel pump and other systems

>>
>> > Any help would be appreciated!!

>>
>> > Richy Jackson
>> > On Jan 2, 11:07 pm, "dave AKA vwdoc1" > wrote:
>> >> Like TonyJ said..............it might be a Failing engine coolant temp
>> >> sensor (CTS)

>>
>> >> Or a fuse in the fuse box. It is positioned to look like a spare fuse
>> >> and
>> >> many times I will find it missing on a vehicle that is not running
>> >> right
>> >> if
>> >> running at all. 8^o
>> >> Examine all of the fuses for any broken ones and stick a fuse in all
>> >> sockets
>> >> with terminals.

>>
>> >> Or it could be the ground wire for the fuel pressure regulator is
>> >> broken
>> >> and
>> >> it should be located at the cold start valve.

>>
>> >> Or it could be a defective fuel distributor.

>>
>> >> Or it could be a massive air leak at the large intake manifold boots.
>> >> Maybe
>> >> a light engine backfire into the intake system along with the gas
>> >> pedal
>> >> being depressed might have caused a hose/pipe to pop off creating a
>> >> large
>> >> vacuum leak.

>>
>> >> Or it could be the ign switch not allowing power to the systems when
>> >> it
>> >> is
>> >> in the ON position. Telltale signs would be those red idiot lights
>> >> not
>> >> being ON with the ign ON or while cranking over the engine.

>>
>> >> good luck and let us know what happens!
>> >> later,
>> >> dave
>> >> AKA vwdoc1

>>
>> >> "TonyJ" > wrote in message

>>
>> ...

>>
>> >> > wrote:
>> >> >> I was wondering of anyone could help me with a problem that
>> >> >> suddenly
>> >> >> developed with my AUDI,

>>
>> >> >> The car is a 1987 Audi 4000s 1.8L
>> >> >> Here is the deal, the car will start for second or two, but will
>> >> >> not
>> >> >> rev up, then it dies.

>>
>> >> >> Fuel pump and filters are new.

>>
>> >> >> Strong fuel pressure to the Fuel injector unit.

>>
>> >> >> The injector unit is sending fuel to the cold start valve, but not
>> >> >> to
>> >> >> the cylinders, thus the car will start but will not continue to
>> >> >> run.
>> >> >> The pressure to the cold start valve is strong, but not a drop to
>> >> >> the
>> >> >> fuel injectors.

>>
>> >> >> I replaced the external fuel regulator with a spare one and checked
>> >> >> for
>> >> >> vacuum leaks etc.

>>
>> >> >> I am not sure where to look from here, internally on the Fuel
>> >> >> Injection
>> >> >> Unit, or to a relay or other control.

>>
>> >> >> As I stated the problem happened overnight.

>>
>> >> >> Any help would be appreciated.
>> >> >> I have not used a internet group before, do I hope I am doing this
>> >> >> right...........

>>
>> >> >> Thanks,

>>
>> >> >> Richy Jackson

>>
>> >> > If the air plate just above the air filter is stuck the injectors
>> >> > will
>> >> > not
>> >> > fire. This can be due to vacuum leaks (you checked but check
>> >> > again)
>> >> > or
>> >> > deposits on the rod above the plate.

>>
>> >> > Open air cleaner and reach up into the intake just above. The plate
>> >> > should
>> >> > move but with a little pressure. Don't force it.

>>
>> >> > Other ideas:
>> >> > Differential fuel pressure sensor (just in front of fuel
>> >> > distributor.

>>
>> >> > Blown engine management fuse (in the side of the relay box.

>>
>> >> > Failing engine temp sensor. In the T44s it is called the MFTS and it
>> >> > is
>> >> > located by the upper radiator hose inlet to the engine.- Hide quoted
>> >> > text -

>>
>> >> - Show quoted text -- Hide quoted text -

>>
>> - Show quoted text -

>
>
> Hey Dave,
>
> Thanks for the reply,
>
> Yup, I have a good old Haynes manual; read it a couple times...!! I will
> get a shop manual..
>
> I did take off the hoses to the fuel injectors and cranked the engine,
> nothing comes out, except for the line to the Cold Star Valve that
> gives a nice spray to the intake...
>
> I tested this with both my original, and a replacement fuel injector
> unit, in both cases, plenty of fuel to cold start valve, nothing to
> fuel injectors. I already pulled the plate up as you suggest. still
> nothing from the fuel injector hoses
>
> Replaced both fuel regulators, car has new fuel pump and filters,
> plenty of fuel pressure to injector unit...
>
> The ground to the cold start valve is fine
>
> As I have tried a replacement injector unit, it does the same thing, I
> am thinking it I electrical, fuses are good.
>
> I read the voltage of the fuel regulator that is on the fuel
> distributor unit or, it shows 8 v, there is an electrical connection
> on the other side.
>
> Something is keeping the Fuel distributor unit from shooting fuel to
> the injectors, any other thoughts?
>
> Tell me again about the temp sensor for the fuel distributor, where is
> it located & would it stop the fuel injector unit from firing?
>
> This car ran fine until a couple months ago, I changed brake lines &
> complete exhaust & then it stopped running...
>
> Any help would be cool..
>
>
> Richy Jackson
>
>
>
>



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