Hyster S60FT:
Anyone having trouble with Tier3 Madas?

I have 3 Tier3 Mazda units (Impco), all converted to CNG.
2 of them have started missing and popping out the intakes. (after ~2200 hours)
No codes, other than the usual STFT <>20%.
Everything checks out with the lap-top, and the miss seems to get better after I reset LTFT's. But only for a while...

I've modded the Tier2's (asin system) to the point that they work well, but they all needed head-rebuilds from running lean for so long.

I was wondering if anyone else was having issues on LPG, just in case this is a self-induced, CNG caused, problem.

The Impco-emissions might be getting damaged from constantly having to be 20-30% richer with CNG (kind of like when the 4.3's were stripping throttle gears)
  • Posted 20 Aug 2008 02:44
  • Discussion started by mike_n
  • Alberta, Canada
Showing items 1 - 12 of 12 results.
it would be unfair to comment
  • Posted 12 Oct 2008 20:26
  • Reply by kevin_k
  • dumfriesshire, United Kingdom
been there kev.what about the plugs on a s3.00xm with a v6 gm engine.take the day off.sounds like you have the same servicing drones as we do. thanks for the reply ed t,thats interesting.
  • Posted 10 Oct 2008 07:08
  • Reply by tugmaster
  • United Kingdom
and because the plugs are a pain in the tXXs to get at.it,s the breakdown guy that changes them ,to get the truck running properly. not the servicing guy pen pushing..... easy life
  • Posted 9 Oct 2008 08:49
  • Reply by kevin_k
  • dumfriesshire, United Kingdom
the arc is searching for the easiest path to battery neg, and if that is through the case of the coil rather than to the ground through the electrode of the spark plug, the electrical charge can damage whatever path it takes. It's the same reason that if you have a spark plug that is miss firing you must also change the spark plug wireset and rotor cap.
  • Posted 9 Oct 2008 08:04
  • Modified 10 Oct 2008 20:03 by poster
  • Reply by edward_t
  • South Carolina, United States
this is a stupid question iknow,but can you explain how the coil goes down when a plug is bad.i worked on cummins,cats and rolls royce/perkins most of my working life and am always willing to learn somthing new.
  • Posted 9 Oct 2008 07:02
  • Reply by tugmaster
  • United Kingdom

Turns out, it all goes back to those crappy Denso plugs...
Now when a plug fails, there's enough energy to fire it most of the time.
If you don't catch it quickly enough, it wrecks the coil and eventually the ECM.
(rotors were much cheaper :-) )

A quick swap to Autolites, a few coils and 1 ECM, and all units running well.

Thanks to all that responded.
  • Posted 9 Oct 2008 02:37
  • Reply by mike_n
  • Alberta, Canada
have you tried calling impco direct?
their website has their phone# and they will usually try to help

did you guys "engineer" this yourselves?
im going to assume you need a whole cng setup including a different ECU
  • Posted 18 Sep 2008 10:59
  • Reply by justinm
  • New York, United States
New York, New York its a heluva town..you know that The Bronx is up..and I'm Brooklyn down
I'll bet the UK CNG truck is not a Tier3 emissions Impco truck.

If it is, I'd pay to get my hands on that ecu file!

(nudge nudge, wink wink)
  • Posted 18 Sep 2008 06:21
  • Reply by mike_n
  • Alberta, Canada
you can get CNG option in uk.
  • Posted 7 Sep 2008 00:20
  • Reply by kevin_k
  • dumfriesshire, United Kingdom
I don't believe that Hyster has a CNG option so you are on your own, expecially if you are modifying their system. They can not help you because they would be liable for the emissions, and I can tell you that they spend a lot of money meeting those requirements and they have no desire to pay any fines for not metting them.

  • Posted 6 Sep 2008 14:37
  • Reply by icestationzebra
  • Wisconsin, United States
Nope, because they are emissions trucks, sHyster is unable to help.
  • Posted 26 Aug 2008 01:49
  • Reply by mike_n
  • Alberta, Canada
speak to hyster dealer. i,m sure cng trucks have different ecu settings
  • Posted 21 Aug 2008 06:16
  • Reply by kevin_k
  • dumfriesshire, United Kingdom

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