What could be the problem?

[VBRED]

My VK is 4.9 litre. I decided to degrease the engine bay and ever since it has problems. It will start and run. It idles at 1500-2000 Rpm but once you select D or R with my foot on the brake it dies. These V8s are new to me. What should I be looking for? I have replaced the leads, plugs, dissy cap and rotor before I degreased it and it was running ok.

[ari666]

did it get any water in the dizzy cap? even a few drops will make it frazzle for a while.

to start with, 1500-2000 is waaaay too high for idle in P. supposed to be more like 1100 in P and 850 in D. so, is it possible that you accidentally advanced the dizzy? or perhaps took vac advance off ported and put it on full vac? im leaning more towards a vac hose issue. check the TVS at the front of your intake manifold, the carbon can, vac advance on the dizzy etc and make sure they are all going where they should be. there are two different camps on JC, then ones who think quaddies need to be on ported vac (me) and those who think its supposed to be on full vac (the people who are wrong) either way you will need to tune for the way you are gonna go with.

youve prolly seen this link before but anyway: how to rebuild/ modify quadrajets (also vac hose diagram)

have a read then go play with your carby, skip through the first section and look at post 8. itll show you how to get it all running right. quaddys are so misunderstood. when actually they are such a KICK-ARSE carby.

but yeah. dunno why i went off topic like that. check all your vac hoses first

[VBRED]

OK I will check vac lines and moister in dissy cap. The gernie could have knocked some vac lines off causing it to idle high.

[undersuspicion]

My first thought was either water in the carby or water in the dizzy.

[DANNY8]

Get some WD40, spray it over all ur electrical shit for the motor. Take ur dizzy cap off, spray a shitload in there, take each individual lead off the cap, spray in the boots of the leeds and on the cap, same at the spark plug ends. Oh and also around the coil terminals, and where the wires go into the dizzy.

If u got a vac leak, one of the best ways to find it if u can't hear it is to spray some flammable gear around the engine bay. Something that if the motor sucks it in you'll hear the revs pick up for a second or 2. WD40 should work, or just about and pressure back. Spray it close to hose ends, and away from the air filter so ur motor doesn't suck it up through there. Just quick little sprays around the place and if u hear the revs increase ya know it's sucked it in, so chances are there's a vacuum leak there somewhere!!

[VBRED]

ok i will give that a try.

[ari666]

im still unsure why your revs would pick up, rather than just go all erratic. i mean, a vac leak really should just make it go erratic, and water in the dizzy would just make it go silly, (i know i suggested both those things) but it wouldnt/shouldnt make the revs pick up.

maybe check the choke assembly on the carby that it isnt fouling on something. check that idle up solenoid. .. i dunno,