GMC Misfire

[Titsy]

How did it go guys?

[ianjpage]

Welllll........

We started at around 9.30 and finished just before 4 (i think) so was a long - COLD day (ask dean about his feet lol) but was a semi-productive day...

Took us a couple of hours to get everything removed and unconnected and then finally remove the upper manifold and wot a sight - totally covered in black 'gunk'  (some of it lumpy and bitty)..... the 'spider' (or bug according to deano lol) was covered in the same crap.

Spent a good few mins cleaning the spider and it looked a lot better afterwards, cleaned the upper and lower bits of the manifold and they looked a hell of a lot better when we re-installed them (with new gaskets).

One other thing deano noticed is that the prongs on the rotor and dizzy cap are majorly fecked - to the enxtent we think its the original cap & rotor - so will be obtaining new ones very soon!

once we had it all back together - fired right up on the button and it is now noticably better to drive but does still have a slight misfire probably due to the cap/rotor.

So overall a good start, the van is working better now and i know what needs to be done next:
Replace Dizzy cap
Replace Rotor arm
Clean spark plugs (they were new 18 months ago)

Then hopefully it be perfect!!

THanks again to dean for his help yesterday

[F Body]

I had a miss fire on our GMC , the rotor and cap were burnt to hell !

Got a new cap, rotor & leads from USless Automotive, when I changed the plug leads I found that two of them were also burnt through from touching the hot manifolds
Some of the new leads were too long, so I made a couple of lead clips ( hangers ) from an old spring I had lying about. That way they couldn't flop down onto the manifolds

[Roadkill]

Quoting: ianjpage

One other thing deano noticed is that the prongs on the rotor and dizzy cap are majorly fecked - to the enxtent we think its the original cap & rotor

I'm possitive that you'll see an imrovement by replacing these.

I've changed many a dizzy cap and the one on the GMC was truly the worst I'd ever seen !

Quoting: ianjpage

THanks again to dean for his help yesterday

No problems.

[Roadkill]

Quoting: F Body

when I changed the plug leads I found that two of them were also burnt through from touching the hot manifolds

This definately wasn't the case on the GMC . . . they're new leads and the routing is good.

[ianjpage]

Quoting: Roadkill

I'm possitive that you'll see an imrovement by replacing these.

I've changed many a dizzy cap and the one on the GMC was truly the worst I'd ever seen !

Yeah it was a tad worn lol!

[v8mad0]

Those vans are well known for needing Dissy caps and rotors, Also the EGR valves need cleaning out now and again.

Well done chaps

[Incursus]

Quoting: ianjpage

So overall a good start, the van is working better now and i know what needs to be done next:
Replace Dizzy cap
Replace Rotor arm
Clean spark plugs (they were new 18 months ago)

Then hopefully it be perfect!!

[FUBAR]

Good news Hopefully you'll see an improvement in the MPG figures now then

[ianjpage]

Quoting: v8mad0

Those vans are well known for needing Dissy caps and rotors, Also the EGR valves need cleaning out now and again.

yeah it had a new egr valve about 2 years ago - PITA of a job to do....

Quoting: FUBAR

Good news  Hopefully you'll see an improvement in the MPG figures now then

lets hope so!!