GM 2.8L V-6 No-Start

swagaero swagaero at flash.net
Tue Oct 14 13:23:07 GMT 1997


Steve Ochs wrote:
> 
> A very common problem on the GM 2.8l/3.1l Chevy V-6 is for an injector or
> injectors to develop a short and pull too much current.  This engine uses
> Multec injectors which don't clog like the older ones, but the windings are
> very susceptible to solvents and the insulation on the windings breaks
> down.  GM issued a service bulletin on not using injector cleaners with
> these injectors.
> 
> Anyways, back to the problem.  I have seen this happen on this engine more
> times than I can remember. Sometimes one injector gets replaced and two
> months later another one fails.  Most prevalent on pre-1992 vehicles.
> Many times the engine will run fine and then after it is shut off, won't
> restart any more.  The test in the service manual is to check the current
> draw on each injector.  Since this is MPFI, I believe that 3 injectors feed
> off of a common 12v line (don't have a service manual handy right now).
> 
> Steve Ochs aka N8TYS- Mfg. Engineer - GM Powertrain - Parma Plant
> Transmission Division (4T60/65-E) - Steve_Ochs at compuserve.com
> The statements and opinions expressed here are NOT an official
> statement of General Motors or the GM Powertrain Division
> 
> '97 Chevy Blazer LT 4x4 4.3L V6    '96 DCM Impala SS 5.7L V8
> '87 Olds Cutlass 442 307 V8        '61 GMC 1500 Fleetside 305 V6
> 


12 V feeds from relay?? or from switched b+??
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