Hyster S80XL:
4.3 Ignition Issue

Pick Up & Mod. replaced and still continues to drop voltage to plugs. Any hints?
We have been all over it at this point.
Will not take hard demand and back fires..
BCS Series
  • Posted 5 Jan 2006 11:09
  • Discussion started by BluzGtr
  • Florida, United States
Showing items 1 - 7 of 7 results.
I was told if the firing order is off, you won't get voltage to the coil.
  • Posted 19 May 2021 07:16
  • Reply by Bill_Menchen
  • Nevada, United States
Bill Menchen
I have had better luck with an AC Delco platium 41-993. Most of the 4.3lt have alongger spark plug hole than a S/b Chevy which also uses th R44 &R45 pluggs. If the truck is LP need to double check the vacuum lines for any leaks.
  • Posted 19 Jan 2008 17:05
  • Modified 20 Jan 2008 12:00 by poster
  • Reply by alan_n
  • Kansas, United States
There is always a right tool for the job.
Check the distributor body for a plugged vent. This will let moisture accumulate in the rotor chamber and cause crossfiring. Latest plug spec for this engine is an AC R44LTS gapped at 0.035".
  • Posted 7 Sep 2006 22:58
  • Reply by leon
  • North Carolina, United States
We are also having problems with the spark plugs glazing up.

Replace the plugs with 44's instead of the factory 42's.
  • Posted 14 Apr 2006 00:30
  • Reply by mike_n
  • Alberta, Canada
Is the check engine light on?

We need to know the s/n so we know exactly which ign. / ecm the unit as
  • Posted 17 Feb 2006 02:39
  • Modified 17 Feb 2006 02:40 by poster
  • Reply by mike_n
  • Alberta, Canada
I just had a bizarre one a few weeks ago.
It was on a 3.0L GM in an H60.
Turned out to be the alternator!?

The only way I can figure it, is that it was leaking enough AC to cause the ign. to pick it up and missfire.
I only found it by accident. Was trying to track down some noise from the front (because of miss-fire I was working my way back to the timing chain).
Pulled the belt and oila, problem solved.

I honestly don't think this is your problem as NO ONE I know has ever seen this but I thought I'd pass it on anyway...
  • Posted 17 Feb 2006 02:25
  • Reply by mike_n
  • Alberta, Canada
ahh the good old 4.3
ok first question !
what engine series is this ? is it pre vortec ?
check the engine pan, is it steel or aluminum ?
im asuming its propane fuel ?
if so what hours has it done since the valves were done ?
one of the most common problems with early 4.3 gm engines were the exhaust valve seats burning out, the heat the propane developes in the chamber far exceeds a gas / petrol fueled engine.
under load it gives the impression of backfiring but in almost all cases when this engine runs on propane and developes such a fault it was the exhaust valve seats
if you get the heads done be sure the exhaust seats are stelite material,
a quick compression check may or may not reveal this.
just one more thing be sure the ignition wire ends are coated with silicon grease inside the plug boots its a must for hei ignition systems
  • Posted 22 Jan 2006 01:40
  • Modified 22 Jan 2006 01:43 by poster
  • Reply by ratchet
  • Ontario, Canada

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