Engine Dieseling

[GunMan9]

I have a 86 K10 and I have put a new edelbrock 600 cfm carb and air cleaner. The mechanic hacked up some vacuum lines and never tuned the truck right. I took a timing light to it and it was at 1750! We got it down to 1250 but the truck still diesels when you shut it off. We noticed that not all the vacuum line we connected because they were cut off. My question is are these supposed to be plugged because of the new carb or are their supposed to be lines run. Ill post pics up of the vacuum lines later when I get the truck back from paint. Does this sound like a DIY fix?

 

[bucket]

Really kind of hard to say without seeing it. If you're (or the guy that worked on it) going to get rid of vacuum lines, you have know why they were there to begin with so they can be properly disabled. You might have a bunch of vacuum leaks currently.

Do you have a timing light? In the mean time, shut the truck off while you're still in reverse or drive.

 

[HotRodPC]

Could be the timing is to far advanced too. If you can't get it idled down with the idle screw, then it's likely the choke high idle cam hanging up or needing adjustment. My 85K1500 hangs up at high idle sometimes. Even though the choke butterfly is off, the idle stays high sometimes and had to stab the throttle repeatedly to get it down. I do need to look at that eventually myself. It's also a Eddy 600 w E choke.

 

[GunMan9]

Is it a bad carb to get? I know the vacuum lines need fixed since he chopped some of them off putting the new carb on.

 

[HotRodPC]

Is it a bad carb to get? I know the vacuum lines need fixed since he chopped some of them off putting the new carb on.

NO, it's not a bad carb to get. Just like the others, it needs set up and tuned right then it's fine. But, the Eddy's don't like trash at all, and not very forgiving. You will need to have a good fuel filter or you'll be clogging idle circuits in the carb and it won't like to idle.

 

[GunMan9]

I have the fuel filter on there that came with the carb. Is there one that most use for our trucks

 

[HotRodPC]

I have the fuel filter on there that came with the carb. Is there one that most use for our trucks

Just don't get the glass see thru one that has replacement elements. Those burn squares to the ground. Just an additional inline fuel filter is fine. I like to put one on the tank side of the fuel pump to keep crap out of the fuel pump too.

 

[GunMan9]

I have a clear one where the carb is. It is the one that came with the carb

 

[HotRodPC]

hmmm, Guess I'm unaware of one coming with the carb as an inline.

 

[GunMan9]

It's a filter that is connected to the carb on the left side

 

[Stroked]

Hmm, I've never seen an edelbrock with a filter attached to it. Got a pic?

I just got a wix inline fuel filter for mine. Part #33033


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[GunMan9]

It looks like this

You must be registered for see images attach

 

[HotRodPC]

That's just a very common cheap but very functional and effective fuel filter. Has nothing to do with the carb though. So you're good that way. But again, I'd put another one before the fuel pump, just cuz that's what I like to do.

 

[GunMan9]

Oh ok. So then what would be the source of the Dieseling. It has to be the vacuum lines that where cut off. The spots are wide open and sucking air in

 

[HotRodPC]

Well yeah, if it's sucking air, that's a vac leak. Other things that causes it is, high idle, or advanced timing.