I picked up this 1987 pickup 2 days ago and am trying to find out why it is not running right. It will only start when using starting fluid and will not hold an idle. It goes through the revs and drives fine, not down on power, if you keep giving it gas. I've changed the plugs, wires, cap, rotor. I will be checking for vacuum lines next. How likely is this to be a carb fueling issue? Also checking compression in the A.M., what should my next step be if the vacuum system checks out?

 

Well..may start by posting in an area for 1987 trucks

 

damnit

 

How about the fuel filter or pump. If it is losing fuel and not fire check that first.

 

I would say check the fuel level at the sight glass to see if it is in the middle when you first start the engine. Post the answer & then I can go from there. Not having the fuel in the middle of the sight glass can affect the staring ability of the engine.

Second, what is your procedure for starting the engine? Do you press on the gas pedal or what do you do to start the engine? Post that answer too.

 

Vacuum diagram below: Can't remember which post I found it on so I can't take credit for it.


http://www.utoyot8.com/FullImage.asp...708%2922R..USA


My 87' ran like junk for a long time. I ended up replacing the carb, replacing all vacuum lines. Still ran like crud until I found the above vacuum diagram. I had several vacuum lines crossed. Fixed those, adjusted idle, adjusted timing, and re-adjusted the idle again. After all this, it ran perfect. The Hanes manual just did not work for me.

Hope this helps

 

First off, if a mod could move this thread to the proper section that would be awesome.

My procedure for starting the truck is key on, pump gas petal 3 times, crank. Will not even sputter under its own power unless the truck has just been shut off.

Talking about the sight glass, when referring to the middle, do you mean the center? or the glass is 1/2 full? I will report back later. Thanks guys!

 

Yip, half full. Right in the middle. You might have to clean the glass and/or use a flashlight.

 

Sounds like it is losing its prime. My '79 does that after setting up a while.

 

It does not look even close the half full. I can take pics later. When checking the sight glass is this after priming the carb or before? I will snag some pics and vids tomorrow, I had to leave the shop early today. Also, this truck has no emissions on it, but most of the vaccum lines are still hooked up. Is there any diagrams out there for a emmisions deleted carbed 22r?

 

OK, that is the correct procedure. I just wanted to make sure.

As Crtzlow has said, it seams that the priming pump, or the main Accelerator Pump is not working or has developed a clog.

The Accelerator Pump will prime the engine when you press on the gas pedal.

Here's my picture I took of the Aisan carburetor. In the red circle is the Accelerator Pump's jet. In this picture the air horn is off, but that jet will still be visable when looking down the carb throat. When you look down the throat, operate the throttle by hand, the throttle linkage is on the oposite side of the sight glass, and look for gas squirting out of that jet.

Let us know your results.

 

I do not see any squirting from that valve, when i manually press the throttle on the carb. Also, the engine oil is about 1/2 gas 1/2 oil, lol. I did do a compression test and all cylinders are at 150psi. I suppose I am already doing well since I only have $600 total in the truck so far.

 

Im not an expert with carbs like slo-mo; replace your vacuuum lines, all of them, its very cheap. Make sure they are connected correctly (years of previous owners?) Check out the vacuum diagram that I posted earlier. Check and adjust timing, adjust idle. Still having problems, dig into the carb. This sequence just might surprise you!

 

Since no gas is coming out of that jet, then the either the diaphragm of the Accelerator Pump is faulty or the passageway within the carburetor is clogged.

That is if the manual linkage has not been tampered with.

 

Engine has ~150psi on all cylinders dry and cold. The oil in it reaks of unburned fuel. I know for a fact that there is a major vacuum leak. One of the bolts holding the carb to the manifold is missing.I will probably pull the carb off to be inspected/rebuilt, reasemble with new gaskets and re-do all of the vacuum lines while completing the 1/2 done emissions removal. Does anyone have a vacuum diagram or pics of a 22r carb with no emissions?

 

That can certainly affect the engine idle.

 

Dude, I included a vacuum diagram link in my first post.