Porsche 924 Scheiße - Fin

[Volksy]

I bought the kit to rebuild mine. I haven't dared pull it apart as yet!

I at least have a spare FD if I do decide to have a bash at it. 

I've watched a load of the videos and discussions on various forums, and it seems to be a 50% chance of success/complete borkage. 

They are at least pretty simple to remove, maybe see if you can source a second hand one off a breaker as a back up.

 

 

[Westbay]

"They are at least pretty simple to remove, maybe see if you can source a second hand one off a breaker as a back up."

 

Unless that's why it's in the breakers ! 😂

[N Dentressangle]

1 hour ago, Volksy said:

I bought the kit to rebuild mine. I haven't dared pull it apart as yet!

I at least have a spare FD if I do decide to have a bash at it. 

I've watched a load of the videos and discussions on various forums, and it seems to be a 50% chance of success/complete borkage. 

They are at least pretty simple to remove, maybe see if you can source a second hand one off a breaker as a back up.

 

 

If anyone can do it successfully it'll be my mate.

The kind of person who can just see and understand how things fit together and work.

[juular]

4 hours ago, N Dentressangle said:

Good to hear - thanks.

I just need a direction on what to investigate / fix next really. The fuel distributor is the only part left untouched so far I think, so logically it probably needs a refresh. Which isn't dear if it's a DIY with the kit job.

Plus my far more dextrous and mechanically gifted engineer mate has offered to rebuild the fuel distributor for me, so if it IS that then we should be OK.

If you have someone who has done a FD before successfully then bite their arm off.

I did try to do mine and was really careful about the whole process, but the car never ran right afterwards. I never did find out where I went wrong.

How are the banjos looking? Even a tiny leak from a washer will cause pressure loss and you won't notice the evidence as the petrol just evaporates.

[N Dentressangle]

8 minutes ago, juular said:

If you have someone who has done a FD before successfully then bite their arm off.

I did try to do mine and was really careful about the whole process, but the car never ran right afterwards. I never did find out where I went wrong.

How are the banjos looking? Even a tiny leak from a washer will cause pressure loss and you won't notice the evidence as the petrol just evaporates.

Not got anything apart yet. Stan is coming over this afternoon, so hopefully we'll get closer to a diagnosis and plan of action.

[N Dentressangle]

Stan has been and inspected. Reassuringly (kind of) he's also puzzled by the car's odd behaviour, and can't see anything obviously wrong with it. He's had a play with the mixture and idle screws and it's running a little bit better - conclusion is that it needs properly setting up for mixture before doing anything drastic, so I'll look into that. It's currently idling at 13-1400 revs, and we couldn't get it any lower without it dying.

I'm also going to pull the throttle body (where the idle screw sits) and give that a good clean. Stan also thinks pulling the top of the fuel distributor and making sure the plunger is moving freely and that everything there is clean would be a good plan, so I'll do that. I hadn't spotted this part of one of the PO's videos:

So I'll give it a good clean at the very least. Stan is not in favour of a re-build - 'don't touch it if you don't have to' - which is all good with me.

[juular]

35 minutes ago, N Dentressangle said:

Stan has been and inspected. Reassuringly (kind of) he's also puzzled by the car's odd behaviour, and can't see anything obviously wrong with it. He's had a play with the mixture and idle screws and it's running a little bit better - conclusion is that it needs properly setting up for mixture before doing anything drastic, so I'll look into that. It's currently idling at 13-1400 revs, and we couldn't get it any lower without it dying.

I'm also going to pull the throttle body (where the idle screw sits) and give that a good clean. Stan also thinks pulling the top of the fuel distributor and making sure the plunger is moving freely and that everything there is clean would be a good plan, so I'll do that. I hadn't spotted this part of one of the PO's videos:

So I'll give it a good clean at the very least. Stan is not in favour of a re-build - 'don't touch it if you don't have to' - which is all good with me.

I'd agree with not pulling anything apart until you absolutely know you have to, as it can add another shower of variables to the mix.

Sticky plungers are notorious on these especially if the car has sat any length of time. 

The way I usually check this is to keep everything in place but remove the bellows from the intake metering flap and quickly move the flap up and down.

If you feel the flap tapping against the plunger anywhere then it's dragging on something. It should follow the movement of the flap smoothly.

[N Dentressangle]

Thanks - I'll give that a go first off.

[Zelandeth]

If someone has had it apart partially before, the seal between the metering head and the body is a possible vacuum leak, so hopefully was changed.  It's also absolutely totally completely critical that the metering flap is properly centralised in its bore.  

The fact my first Saab ran pig rich at idle was simply because it wasn't and was juuuuuuust touching one edge as it returned to idle.  That's also why it needs to be kept clean enough to eat your dinner off.

[N Dentressangle]

Very interesting - thanks. It doesn't look very clean in that video!