Problems when warm (Cont'd)

[alien.46.uk]

**Reposted this here as I think the origional place is wrong.**


Hi All,

I posted a while ago about a problem with my 8v '94 GTI. When warming, car runs fine. Temp increases to about normal and start to missfire, and cough and splutter and on the odd occasion eventually cut itself out.

So far the following has been changed:

Coolant
Water Temp Sensor
Dizzy Cap
HT Leads

Wiring has been checked as far as accessable and seems fine. The earth point is fine and solid. The is one of the three threaded bits without a connection attached, but either way the ground for the water temp sensor is on there fine.

As said, when first warming she's fine and will rev freely, when warm she'll cough, splutter, miss and sometimes eventually cut herself out.

No error codes are read and I am in total confusion.

I suspect if the timing was out, she wouldn't run fine on warm up?

I myst also add that when she coughs, splutters and runs rough, when I disconnect the Water Temp sensor, she will go back to running fine and will drive quite nicely also. Plug it back in, all will be fine for a while before going back to it's bad state.

I'm after any more help as it's winding me up now and I need to get her sold soon.

I've taken some pics of the engine bay so anyone can see if anything looks majorly wrong from the pics:

















Large scale images available.

After a Wiring diagram for this model and year to if possible incase its something wrong there.

Many Thanks.

[Wolf]

Hi there,

Interesting... I'm just wondering and this is a bit of a curve ball but how long has that induction filter been there? It looks mighty close to the engine in your pics and from what i can see looks quite dirty... It could be as the engine heats up she's sucking up the heat from the engine and that's causing you problems. I can see you have some sort of cold feed there but even so.

Just a thought.

Andy

[alien.46.uk]

Thanks for the reply.

No idea on the time the pods been on. I've only had her 3 weeks as a p/x on a bike. Was just to tinker and fix up and sell on as I normally do with bikes.

The filter isn't in the best of conditions and I suspect has a fair few miles under its belt. I will give it a clean, but in all honesty, I dont know if it will help. It was similar under driving conditions but then a dirty air filter and a cold air feed that looks to be done by a 3 year old can't help in any case, so it's worth doing anyway.

[Mikester]

Im thinking that funky wiring on the MAF might be up to something.

[Wayne]

Im thinking that funky wiring on the MAF might be up to something.

+1 also what is the unit on the inner arch, never seen one before.

[alien.46.uk]

Oddly enough, there's no reason for all that blue tape. There's no modified wiring there at least anyway. His interior wiring was a little bit "interesting" but that was soon rectified and everything now functions 100%. However the engine continues with this problem. I will investigate this wiring further incase something was missed.

Does the 2E run an Inlet Manifold Temp Sensor before the MAF as I've seen in some later 8v GTi's ?

If so, mine is not there any may account for the extra unused earthing point ... ?

Thanks in advance once again.

[alien.46.uk]

Im thinking that funky wiring on the MAF might be up to something.

+1 also what is the unit on the inner arch, never seen one before.

Tbh I've never really paid much attention to that. I will take a good look and take some more pics.

Any 2E 8v Wiring diagrams about?

Thanks.

[Mikester]

Aint that the carbon cansiter?

[Wayne]

Aint that the carbon cansiter?

Don't think so.

The maf / wiring / air filter all looks bodged to me.

[Mikester]

I agree wayne. Would take the wiring back to where it joins, and replace it.