Fuel in Cylinders

[GAShan]

Leons' '93 Typhoon. Truck would not start, cranked slow. Almost like hydrolock. Found oil had a lot of fuel in it. Pulled all 6 plugs, rear 4 cylinders have very wet plugs. Cranked truck with plugs out and got spitting of fuel from all holes, mostly 4 rear. Put in new plugs, truck fired but sputters and misses. Does it sound like the fpr is torn and leaking in through vac system? I find it unlikely that multiple injectors are staying stuck open after shut down and residual pressure in the rail is going into the cylinders. Is there anything that can hold the injectors open after truck is shut off? I did not have Diacom with me to see injector duty cycle so I don't know if they are being commanded wide open when running, dumping too much fuel.

 

[Captain Morgan]

Re: Fuel in Cylinders

FPR was the first thing I though when I read the title of the thread. My 92 had the same issue when I got it, probably the reason the previous owner gave up on it.

 

[TYTILIDIE]

Re: Fuel in Cylinders

ECM can also cause this.

 

[GAShan]

Re: Fuel in Cylinders

How can ecm cause this, what do I look for?

 

[Beavis]

Re: Fuel in Cylinders

ECM could because of a bad IAC. I had a bad ECM dumping a ton of extra fuel but truck ran ok, also had a check engine light from it. The wife was folowing me and said she could smell heavey rich exhaust and was slightly black when acclerating. If no check engine light, I would think AFPR also.....

 

[ziembic]

Re: Fuel in Cylinders

Could also be a stuck open injector. Computer tells it when to open, but if it is stuck open than fuel could be flowing. But I agree with everyone else, it is likely the fuel pressure regulator due to it being in numerous cylinders. Should be easy to check, just stick a fuel pressure gauge on the rail.

 

[sytyguy]

Re: Fuel in Cylinders

Easy to test FPR.....disconnect line and plug as if doing FP test. Also inspect the front intake grounds. When we first fired the engine rebuild in the '92 Syclone, Scott forgot to hook those up. Ran ridiculously rich. AFRs were well below 9.9 at idle. Injectors were wide open. Took us a minute to figure out.

 

[SloGN]

Re: Fuel in Cylinders

Gary


If you suspect the ECM is bad and grounding out the injector to stay open. just unhook the inj harness and then prime the pump and see how long it takes for the pressure to drop.




A bad regulator will cause this issues too. Unhook the vac line and prime the pump fuel will spray out of the nipple on top. cheryl's ty done this last summer.


It's hell on rod bearings, rods etc..............

 

[Neelsonwheels]

Re: Fuel in Cylinders

Easy to test FPR.....disconnect line and plug as if doing FP test. Also inspect the front intake grounds. When we first fired the engine rebuild in the '92 Syclone, Scott forgot to hook those up. Ran ridiculously rich. AFRs were well below 9.9 at idle. Injectors were wide open. Took us a minute to figure out.

Can you explain this to me? I am not sure what to check. Are you reffering to grounds of the sensors at the clip or are you saying the grounds of the injectors? I am having kinda the same issue as this guy.

Thanks

 

[sytyguy]

Re: Fuel in Cylinders

Can you explain this to me? I am not sure what to check. Are you reffering to grounds of the sensors at the clip or are you saying the grounds of the injectors? I am having kinda the same issue as this guy.

Thanks

Sure. Ignore the instructions below (part of a how-to on SyTy engine removal I did), but it's the wires that are pointed at on the right. Make sure the terminals are clean, the bolt is clean, bolt is tight, and the wires are secured tightly.