[DML] Re: Engine runs rough after pop & smoke from engine bay

["Harold McElraft" <hmcelraft@xxxxxxx>]

A lean fuel condition can cause a backfire. That injector may have 
already been loose and causing the system to hunt for the right 
air/fuel mixture. Your adjustment may have just run the frequency 
valve to the limit so the engine RPM swings stopped but the fuel 
mixture went even more lean. The best way to see what is happening 
with the O2 sensor and the frequency valve is to perform the analog 
dwell meter test described in the Technical Information Manual on page 
122-123 - and just assume the CO falls in the proper range. Be sure 
all vacuum lines are on and sealing well.

To be sure the fuel system is clean you can run some Marvel Mystery 
Oil in the fuel - just follow the instructions on the container. It's 
the best cleaner for the DeLorean fuel system - good for the engine 
too.

Harold McElraft - 3354



--- In dmcnews@xxxxxxxxxxxxxxx, "deepdmc" <deepdmc12@xxxx> wrote:
> Thank you soooo much. The problem has been fixed. Apparently what 
> happened was the engine backfired and the pressure pushed one of the 
> fuel injectors out of the boot. I pushed the injector back in and 
> secured the retaining clip and the rough idle completly went away. 
> On a side note what would have caused the backfire in the first 
> place? This is the first time it has ever backfired, I recently 
> leaned the fuel adjustment because the engine started to surge at 
> idle, but i only leaned it a very tiny amount. Once again thank you 
> so much.
> 
> Justin Alivandi 16579
> 
>






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