Quote:
Originally Posted by Nirvana
Many ECU units are fitted with a 'limp home mode'. NOT GIMP MODE When it detects that something semi-serious is wrong, it enters the limp mode, which means that the engine won't rev beyond a pre-programmed speed.
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Which is completely different from the *Gimp* mode previously discussed. For example, if a fuel pump is failing, the computer compensates for low fuel pressure using various changes such as extending short term fuel trim. Gimp mode - an unofficial backup system. Not the well defined and intentionally programmed 'limp home' mode that is another system.
Unfortunately, some mechanics will clear the "check engine" light. If the light does not immediately re-illuminate, then that mechanic says, "No problem." Of course there was a problem. But some techs are sufficiently trained to find it. So they pretend the alarm never really occurred.
Plug misfire? One misfire never causes a 'check engine' light. The failure must occur repeatedly. Some techs pretend that problem never existed only because it is intermittent.
And yes, trucks have no plugs to misfire which is known to minimally trained techs.