Not running right...

Ok...before i came away with work the jetta was running well...but then it just started losing power. I would have my foot down, and it would just drop off, and then come back again randomly...the last time it happened it was the wrong dizzy cap...but now it has had new points, cap, rotor arm, and plugs. The only thing i can think to try next is the coil.

Anyone got any suggestions?? Need some ideas for when i get back so i can order parts.

I've got a spare coil here you can have mike.

seems strange, but yeah its either electrical or fueling

hi i had the same sort of problem changed every thing. ht leads plugs rotor arm dis plus cap. it was bloody carb iceing might help or not
hope you sort it out mate

^^^exactly what I was gonna say, carb iceing.
Would explain why it suddenly started at random if the weather is cooler and more moisture in the air now than before. Also if it recovers by shutting off the throttle that usually points to iceing as once the air flow stops the pressure in the carb venturi rises and the heat soak from the engine will melt it in an instant.

Is your hot air feed present/intact/functional???

Tobz wrote:

Is your hot air feed present/intact/functional???

There should be as i fitted the air feed pipe before mike bought the car.
Was only the alloy flexi and not the genuine black flexi vw sell.

i've had similar problems with a polo & my rocco, sounds like carb iceing. check the flap in the air box, pull pipe off and give it a suck the flap should move, if not replace or free off. hope this helps.

oooo i used an alloy flexi thing before, problem is it doesnt keep the heat due to it being alloy, need proper insulated stuff like from vw. carb icing sucks

Many thanks for all the replies will try the air flap when i get back and get to work on the car. I may well get that coil off you if that is alrite caddyrage?

Can i order the hose from gsf? or does it have to be from vw?

ON MY ROCCO I USED EXHAUST HEAT WRAP AROUND THE HEAT PIPE,IF YOU HAVE ANY. YOU COULD TRY GSF, WHAT ABOUT RAMSEY BREAKERS.

VW Mike wrote:

Many thanks for all the replies will try the air flap when i get back and get to work on the car. I may well get that coil off you if that is alrite caddyrage?

Can i order the hose from gsf? or does it have to be from vw?

Yeah sure, just gimme a tex or pm when ya back mate

mark-1vw wrote:

ON MY ROCCO I USED EXHAUST HEAT WRAP AROUND THE HEAT PIPE,IF YOU HAVE ANY. YOU COULD TRY GSF, WHAT ABOUT RAMSEY BREAKERS.

Not been to ramsey breakers before...but will have a look when i am back

CaddyRage wrote:

VW Mike wrote:

Many thanks for all the replies will try the air flap when i get back and get to work on the car. I may well get that coil off you if that is alrite caddyrage?

Can i order the hose from gsf? or does it have to be from vw?

Yeah sure, just gimme a tex or pm when ya back mate

Cheers dude will do and will definately be there on the 29th

Woudl a piece of rubber hose (for example turbo hose work)? or would i need to insulate it?

and if so...does anyone know the diameter (in mm)of the hose which i would need to fit it and a rough length? just so that i can order it now and then it will be at home to change straight away?

What kinda speed was you driving at mike when it was causing probs?

Icing will only occur at approx 60+ as the air become very cold caused by draft aswell.

Thinking it could be the mechanical fuel pump on the front of the block now. Hmmm!

I think it was happening at around 50-60...that rings a bell anyhow...im sure when i eased off it stopped...then tried to speed up and it did it again.

hmmm it did that when i had it but as i had that stupid air filter on i assumed carb icing... When it happened to me once it wouldnt restart i got out and tapped the coil and it restarted which i thought was odd. Always meant to replace the coil but just forgot as sometimes it had the problem sometimes it didnt...

Coil has been replaced, so as the ally hose from the manifold...it now appears to be the fuel pump, but i will find out tonight when i fit a new one

our survey says....eh eh...it is not the fuel pump :( nor is it the rotor arm, or dizzy cap unless they are the same ones that i had on it before!!!

God Damn it!!!! I am getting a little annoyed with it now...it doesn't help that i was looking at engine conversions for it either

have you tried running a low pressure line down the fuel lines with the cap off to clear any little blockages that may be there from a past rusty fuel neck? Common mk1 problem.

The aa guy who came out on sunday when i broke down on the a1 did take the cap off and force the fuel to go back to the tank...is this what you mean?

if he didnt take the feed hose off of the pump and run a low pressure compressed air line down that hose then try that. He probably just made a vacuum to suck the fuel back would be better to blow down the line. If i was a betting man i would say its down to the rusty filler neck as when i bought the car he offered me a filler neck with it as well that he said he bought for it. I had that off him.. well i still have it, so i bet its got a rusty filler neck and the crap has got down the lines, have you tried cleaning the carb out?

If its none of that then i would personally say you need to get a weber carb for it and bin that pierburg.

i have run some carb cleaner through it, but can try again tonight.

Where would i get a weber carb from?

have you tried taking the top off the carb and cleaning out the fuel bowl in side as gunk usually builds up at the bottom and clogs up the jets. Had the same thing happen on my beetle and gave the exact same symptoms.

You can get webers from ebay or ask about on here, edition38 etc.. Shouldnt cost too much. No more than £50 really? But they make quite a bit of difference to economy AND power.

Will have a look at the fuel bowl tonight...if it's not that then i will be taking the fuel tank out and cleaning it at the weekend...went to tesco last night, not much fuel in the jetta, and it took me 40 mins to do 8 miles!!! ran better when i had put more fuel in so could possibly be something in the tank. Is there any kind of filter/strainer at the outlet for the tank?

i think there is a little gauze filter in the sender unit which i think is accessed from the boot or under the back seat i cant remember as ive never done it on a jetta.