Running Issues with My EV Code 'Rocco Engined Mk1 Caddy

hi there everyone, having a few problems with my caddy gti. I've spoken to Bren off this forum, he told me to ask you lot, so here goes.

Here gooes:-

(eexcuse my spelling - keyboard is knackered on my lap top)

Caddy started running oddly recently, runs fine, but then starts to play up, missfire???

It will start fine from cold, tick over, and rev up beautifully, however as soooon as it  decides to play  up, off itt goes. Sstarts missfiring, woont rev and eventually dies.

So far i've changed the  foollowing;-

fuel Pump
Accumulator
Injectors
Distributer / hall sender
leads
plugs
rotor arm
and metering head

However, noone of these have  cured the problem, and itt still plays up.

Any other ideas what could caus this???

Im not sure the  metering head is any good, could this cause running problems when under load etc, as the ptroblem usually starts as sooon as you go to pull away / drive somehwere.

Need ideas today, as im working on it tomorrow, and im about to give up, spent hours oon it already, and getting pi**ed ooff with it now.

I have taken my mettering head apart, and removed the   4 little screws under the allen bolts, could these be  what is  causing the  problem?  Prhaps they aree out of adjustmnt or something.

Timing is all present and correct, set up with stroobe, all plugs are firing continuosly, and everything seems to be ok???

I have tried lifting flap in mtering head, and  all injectors are firing,  though i havent checkd this when it  stops running.

Any other iddeas/??

Fuel pump relay is  also  fine btwe, cheers

First thing you need to do is find out if its running rich, lean or an ignition issue.

how about faulty hall sender on the distributor, or the distribution chip (forget what it's called, under the wiper motor splash guard) ?

nope, deffo not hall sender, brand new one fitted, still the same, also brand new fuel pump, still no difference?

Tried metering heads from a few diff cars, still no difference, and its deffo working as i cant hold the flap down when its revved.

The thing only runs on like 2 or 3 cylinders constantly? surely it wouldnt just decide to pack up a head, it ran fine and then just started playing up one day when i went to start it

Here's the list of stuff i've tried

Checked all vacuum hoses
new metering head x 5
brand new fuel pump, fitted
diff accumulator - fitted
new hall sender and dizzy cap / rotor arm - fitted
new leads fitted
new plugs
new cam belt and check and adjust timing to correct spec using timing light
more fuel
cleaned injectors - however these did have some crud in them


One other question, should all the injectors pulse when metering head flap pulled up and cranking over engine?

I seem to have 2 diff kinds of injector in my engine - two outer ones, cyl's 1 and 4 ar running injectors with a kind of double circlip looking setup on the injector end, and the two middle injectors are the same as my mates mk1 golf?

However, when cranking, the two middle injectors are hosing the fuel out constantly, and the outside 2 are pulsating slightly?

Help me please people as i wanna sort it this weekend so i can mot her and flog her on, cheers

P.S If all else fails, can i fit a 1.6 mk2 driver head on my ev code bottom end, and convert it to a 1.8 carbed lump?

Have you checked the mixture? Or checked to see if you have ignition misses?

Rixy said

I seem to have 2 diff kinds of injector in my engine - two outer ones, cyl's 1 and 4 ar running injectors with a kind of double circlip looking setup on the injector end, and the two middle injectors are the same as my mates mk1 golf?

However, when cranking, the two middle injectors are hosing the fuel out constantly, and the outside 2 are pulsating slightly?

When I was having poor idling problems my injector seals were totally shot which allowed too much air into the mixture. This in turn felt like it was firing on 3 cyls.

There are 2 types of injector, one of which is air shrouded and is found on mk2's and possibly later mk1's and one that is not air shrouded.

If you've got a leak…and it looks like you've got a major one there….I'd be looking to tryin to get that sorted, you'll have a fire otherwise.

yes, dont know how to check the mixture, isnt that the little allen headed bolt deep inside the meterin head, down the hole at the back?

Also, have checked for ignition misses, put the strobe on every lead and checked for light - all seem to be ok, and all plugs are sparking.

Have also tried a diff coil, and a diff ignition module amplifier thing?

i have checked for fuel leaks, and other than the one i caused my self yesterday, all seems to be ok.

My injector seals are pretty crappy looking, but look like they are diff to the mk1 gti items? mk1 seals are basically a plain o ring, but mine look kind of hexagonal shape? long and thin? can you still buy new ones?

Rixy said

yes, dont know how to check the mixture, isnt that the little allen headed bolt deep inside the meterin head, down the hole at the back?

Also, have checked for ignition misses, put the strobe on every lead and checked for light - all seem to be ok, and all plugs are sparking.

Have also tried a diff coil, and a diff ignition module amplifier thing?

You've described how to ADJUST the mixture, but not to check it. For this, you'd need a gas analyser (?75 from FLAPS).

That's not a test of ignition misses - you can have an ignition miss even with the spark plug spraking, if it doesn't spark enough energy or the mixture is too lean or rich. You can detect ignition misses using a wideband lambda. A wideband lambda will also help on the mixture issue. But I imagine these are too costly for you.

I'd be interested to know if there's a decent DIY way of checking for ignition misses. I've seen kit which measures the voltage delivered to each spark plug, but it was a garage/large machine, probably costing many thousands.

hmmmmmmmm i see, will see how i get on at the weekend, keeop the sugestions coming people, greatly appreciated