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Hyster H110 XL with GM 4.3 V6 & TBI fuel injection-flooding& running rich

Number of messages: 8

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fixitandy
Pennsylvania, United States

I'm reposting this because it was first posted in the mechanical trouble shooting forum, and things get lost quickly over there.
   I've been having a problem with a hyster H110xl. it has two problems which may be related, both with the gasoline only fuel system.
  The first problem is that it chronically runs too rich, and some times floods if it doesn't start on the first attempt. While its running it frequently bogs down while trying to accelerate and once and a while even backfires through the TB. It also some-times puffs black smoke, there is a huge soot stain on the inside of the CW, so its been doing this for a while, I would guess.  With the air horn removed I can actually see fuel pooling up on top of the butterflys while it idles. I'm not very experienced with TBI style injection, but it looks like way to much fuel coming from the injectors to me. According to the available records the only thing ever replaced in the fuel system was a throttle pos sensor a few months ago. The spark plugs were also just replaced due to fouling, and at the current rate it won't be long before they're fouled again.
  What should I look for to solve this problem? Check fuel pressure? Faulty ETC or MAP sensor? Bad ignition module? Worn out injectors? Bad O2 sensor? Does it even have one? While its running there is no CEL.
   The second problem is an intermittent failure of the butterflys to open when the throttle cable is pulled.  There is some sort of spring-loaded mechanism that interacts between the throttle lever outside the TB, the throttle shaft and the electronic governor. I think that it could be related to the flooding problem because when I witnessed it sticking it was also one of the times that the fuel was pooling on top of the butterflies (while the engine was idling) when the engine was shut off it immediately returned to normal. Any knowledge of this problem out there? Thanks.

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fix it right or call some one else

Posted 26 Jan 2011 05:50 AM

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edward_t
South Carolina, United States

serial number?

-------------------------
webhome = http://forktechs.com
"it's not rocket surgery"

Posted 26 Jan 2011 08:53 AM

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fixitandy
Pennsylvania, United States

S/N G005D093xxT

Posted 27 Jan 2011 04:59 AM

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edward_t
South Carolina, United States

have you checked the fuel pressure from the pump? (not too much pressure) and have you checked the o-rings on the injectors?
and have you closly checked for vac. leaks?

-------------------------
webhome = http://forktechs.com
"it's not rocket surgery"

Modified 27 Jan 2011 09:31 PM
by poster.

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fixitandy
Pennsylvania, United States

I haven't been back yet, but I did pull out my old fuel pressure test kit for the next time I go back to it. It has a spring & diaphram regulator built into the TB assembly and a return line back to tank, like many modern MPI injected auto engines, so if there is an over pressure problem its probably a restriction in the return line. Unlike automotive fuel injection, it doesn't have a vaccum line to the atmosphere side of the FPR, so its not designed to alter the pressure with engine load. It does have a MAP sensor to gauge engine load, and they are cheap so I've already ordered a new one, and I plan to replace the vac line to it when I replace it. I've also ordered an ETC since they are also cheap, and a known failure point on GM engines (and a faulty ETC will often make the ECM think the engine is ice cold and therefore over fuel the engine). The injectors have no visible fuel flow when unplugged, so I think the Orings are ok, and since they are above the throttle plate they wouldn't be a source of vaccum leak. Speaking of vaccum leaks, I should probably replace the pcv and its rubber grommet in the valve cover too. There isin't much else on this to to leak vaccum other than the intake manifold gaskets, and I don't even wan't to think about that.

Posted 28 Jan 2011 03:15 AM

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edward_t
South Carolina, United States

I think the fuel pressure on these is only about 10psi at the injector , (hopefully someone can correct me if I am wrong) and most mechanical and after market electric fuel pumps make about 18PSI (and up) .

-------------------------
webhome = http://forktechs.com
"it's not rocket surgery"

Posted 28 Jan 2011 09:27 PM

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vxtech
Virginia, United States

fuel pressure is 10 psi like ed said, and that pressure is maintained by regulator behind injectors on fuel meter cover,check fuel pressure, there should be shrader valve on return line to attach gauge to,the delay in throttle plate movement sounds like worn governor activation gear, disassembly for inspection required to confirm condition-check fuel pressure 1st, also as truck is being cranked check tbi injector spray pattern with timing light, you should see a nice uniformed spray cone underneath injector, any excess dripping while cranking,running -bad regulator, dripping after shut off also caused by leaking injector or upper fuel meter gasket or cover, also check engine oil for excess fuel and change oil if oil is gas washed or engine damage will occur

Posted 4 Feb 2011 09:32 PM

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pastrana_j
Puebla, Mexico

Fuel presure in tbi injection system is 14 psi If the engine doesnt start easy ,you can try cranking the engine and depressing the accel to full, that permits the fuel cut and the fuel flooding ignites.

Posted 8 Feb 2011 06:00 AM

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