Engine hesitated, smell of gas in cabin...

[DRII]

so it effing happened again!  :blowup:

dropped it off last night at a recommended shop that can handle our type engines.

Guy just calls me a says they ran through all the diagnostics (and service bulletins) and everything checks out, he even took the car out with the computer connected to make sure, said it felt good and looked good on the computer.  he also said they ran each cylinder and tested each separately and each is running fine, also checked all the spark plugs.

the car did feel fine driving to the shop, but earlier driving to work the car was shaking noticeably and the engine light came on, I also smelled gas at one point.

So, since i'm already paying 100 for diagnostic, i'm going to have them do a fuel injector cleaning.  I also want them to secure the knock sensor wires, I actually sent them some links showing what i'm talking about.

is there anything else I should ask them to do?

 

[DRII]

If the Techron cleaning effects hold for 6 months/5k miles, then you are probably good.  If you have to repeat  often, then you have to dig deeper.

Maybe consider 5 oz MMO every fuelup see if that helps.

so Marvelous Mystery is good for our engines?

 

[lamrith]

Just spitballing here....

Any chance you have an SCT tuner?  No idea what to log, just thinking if have it handy and plugged in you might be able to log something if it does it again, while it is doing it.  That might help guys here and your shop of choice?  Maybe folks here could recommend some PID's to have setup to log?

 

[SHOdded]

Shaking implies an injector on its way out to me, unless there is a loss of pressure in a fuel line somewhere, which would lead to a smell in the passenger cabin.  On occasion we have seen the line to the HPFP needing to be brazed due to a leak there, but not really anywhere else.

MMO is fine to use, as long as it is 4.5-5 oz per tankful.

Not sure what year your MKS is, but did it have the fuel pump/control module recalls on it?