My '74 Jimmy

[centexan]

Thanks guys for the response. I appreciate the help. A little update. I took the throttle body off and took it apart to see of there was any trash in it. There are two hard lines coming out of the back of the throttle body. Are they both fuel lines in? I put a bowl down to catch the fuel and turned on the key and fuel only came out of one of the lines (the one on the drivers side). Is the second a return line? I'm not real familiar with the throttle bodies. I really don't want to drop the tank if I don't have to so thanks for the advice. I wanted to take this on a camping trip in two weeks, so I'm hoping to get the problem fixed before then.

[centexan]

Originally Posted by motornut

on my 87 burb the power wire for the pump burnt/baked over the wheel well,looked like it had been puncured/nicked salt got in it was hard to bend and crunchy

Thanks, I will start checking wires tomorrow. A friend also told me to check grounds etc too for any burnt out sections.

[Jonboy]

The larger line (3/8, should be driver's side) is fuel in, the smaller (5/16) is the return from the regulator.

[centexan]

Originally Posted by Jonboy

The larger line (3/8, should be driver's side) is fuel in, the smaller (5/16) is the return from the regulator.

That sounds exactly like what mine is. The larger is the drivers side and the fuel came out of that. I just wanted to make sure that second line (return) wasn't clogged. Ok. That answers that.

[Jonboy]

Have you replaced the filter yet?

[centexan]

Originally Posted by Jonboy

Have you replaced the filter yet?

Not yet, but the very next thing to do.

[Jonboy]

I would try that first. The one on my old dually was clogged, and the new one really woke it up. That, and they are cheap, too. Hope it's that simple.

[Mkcustums]

Just for the heck of it since you're right there, did you pull your dizzy cap off and take a look inside? It's happened to me before. I've owned about 46 vehicles, worked on who knows how many, seen the stupidest and simplest things stop a rig from running.

Just cause you got gas and it died I wouldn't focus all your attention there, easily could be a coincidence. I bought my '72 and it died twice before I got it home right after getting gas, neither time was fuel related. But fuel would have been my first thought I think too!

[centexan]

Ok, so replaced the fuel filter and that helped immediately. It would start and idle for 30-45 seconds, maybe a minute and then die. A friend of mine was helping me and he noticed that if he disconnected a certain vacuum line, it would run; if it was connected it would die immediately. As it warmed up it got worse. So still not sure whats going on. I was able to get it back into the garage. I also picked up a viair compressor and tank today on craigslist. A little at a time.

[centexan]

OK, so changed the map sensor and the hard line vacumn between the map sensor and the throttle body. I also changed the fuel pump relay. It is still doing the same thing. It is throwing error codes 33 & 34. I have searched the boards and online and haven't found a much good info. Anybody have any ideas? Thanks guys.

[dccarpenter]

Check your ignition coil and module..they can make a vehicle stutter sometimes if they aren't working right. Ignition coils are dirt cheap and a 10 minute repair.

[muddyblazer02]

I don't see how the coils would give the codes discribed. I'm more inclined to look for chaifed wires or damaged connector going to the map sensor and controller, it could be a controller issue also. That is where I would start. Were he looking at codes dealing with ignition problems then I would say that would be a valid avenue to research. Just changing parts because it cheap and could cause similar symtoms won't get the truck running any quicker and would be wasted money on parts he didn't need.
Ken

[dccarpenter]

forgot about the code part of it, I'm running all pre-computer era vehicles so troubleshooting can be more imprecise.

[Patriot]

Originally Posted by centexan

Here are a few more. Photobucket seems to be cooperating today.

That thing ROCKS!!!!!

[centexan]

Originally Posted by Patriot

That thing ROCKS!!!!!

Thanks man! I appreciate it. It sucks that I haven't been able to fix it, I could have used it in the bad weather we had recently. I can't wait to get it on the road and for spring so I can go top less.