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I have an 87 turbo pickup that I got a few years back and finally got some time to work on. Previous owner thought it might have a bent valve as it has a misfire, I popped the valve cover off and checked they all seem ok so I did a compression test cylinders 1,2,4 are all 145 cylinder 3 is 130ish not sure if this would cause the misfire I think the turbo engines are only 7.5 to 1 compression ratio which is somewhere around 140. Any ideas would be appreciated, I have not checked the injectors but all plugs were slightly wet. The truck is one owner and only has 100k miles.
Have you checked for any engine codes? How do the wires, cap and rotor look? Is the miss under load? Vacuum leaks somewhere? Did you check the timing? How old is the gas?
Good luck. These turbo trucks are kind of a fun novelty. They can be a money pit, but I love mine.
I swapped the cap rotor and wires off my 22re and there was no change and I have not checked for codes I have always been terrible with obd1. I also threw in new plugs, runs slightly better and I have good spark at all plugs. I have not checked timing and I did the carb clean vacuum leak check and found nothing, misfire is always there
Well that is definitely a good start. Any easy way to check for vacuum leaks is just spray down your vacuum connections with ether or brake cleaner and see if the rpm increases. I would be pretty suspect of the air-box to turbo rubber boot. That little line that goes to the PCV from that boot is infamous for cracking since it's metered air at that point.
It's also pretty easy to disconnect the battery for a while (to reset the codes) and start it up. Could be a sensor that is only looked at when it gets warm.
Battery was out for months and It isn't a vacuum leak, it is definitely a misfire on cylinder 3 when I pull the wire off there is no change. I am going to check for voltage and pulse at the injector if that doesn't get me anywhere I will swap an injector.
Well I finally figured it out (I think) I pulled all of the injectors and found cylinder 3 completely plugged with debris and cylinder 4 partially plugged I also found the fuel log to be half full of debris. Who are you guys sending your injectors to for rebuild? I am going to send all 4 and the cold start, not sure what is going on but the intake runners were completely full of fuel and the truck has not run in at least 4 months maybe a partially stuck open cold start injector?
If the injectors are that clogged up, what does the filter look like?? What about all the metal and rubber hoses?
What about the tank and pump? All that crud came from someplace, and the tank is the most likely culprit. You may need to drop it and clean it out. Maybe even coat it. If it's too rusty, and that's what the crud is, you may need to coat, or replace the tank completely.
I sent the injectors including the cold start to 22re performance, we shall see how they do, I did test all of them to see if they were opening and they all tested good. It isn't rust I think someone might have been messing with the previous owner and threw sand or something into the tank. I am in the process of cutting up my 88 pickup and will be swapping the tank and pump they are still like new, I will change the filter and flush or replace the main line. Thanks guys for the input, witchunter is currently not taking orders. I will let you know how 22re does.
The 4Runners have a much easier way to take a look into the tank, and/or replace pump etc. They have a little access port under the back seat. The pickups, you have to either take the bed off, or drop the tank.
You should probably take the fuel rail the injectors go onto off and check out what's in that, as well as verifying/cleaning out the pulsation damper and pressure regulator. I'd wager they're gunked up pretty good as well. If you have that much crud in the injectors, you have it in all the other goodies in the fuel delivery system too.
Don't forget the little hardline that goes up to the cold start injector. It's probably full of crud. You don't want to get nice, clean, injectors back, only to have them get gunked up again with what's still in the fuel delivery system.
Bed is already off the truck and tank is being removed anyways so I can french in my front leaf spring mounts. I cleaned the rail and put the little tube to the cold start in the ultrasonic cleaner, I don"t really know what to do with the damper and regulator as they don"t come apart, I let them soak in gas for a bit the other night and shook them to see if any debris came out and nothing did so I might just chance it. I am going to take the filter off tonight I still don"t understand how so much crap got through the filter, about half the fuel rail was full of debris.
I am here to report back, the clogged injector was the problem, truck runs like new. I have not swapped the tank out but it is full of water, I took the pump out and put it in a 5 gallon bucket and flushed all the lines truck started right up and runs perfect. As for my experience with 22re performance I am still on the fence, they are very knowledgeable about our trucks and these motors, however they were almost twice the price and they did not paint or really clean up the injectors (externally) and they did not give me any flow reports, I also have one that is leaking a little and I do not think it is anything I did.
Mar 27, 2020 | 02:59 AM
