new fuel pump, still Knock

[bholker]

Installed new Walbro 340 w/ wiring kit yesterday. Running 11 PSI boost and 93 octane, and still getting about 3.5 degrees knock retard.
O2's are at or a bit above 800 for the most part.

 

[Chuck Leeper]

More info

What else do you have in the line of info on the operational parameters??
IE: O2 x counts, TPS, MAf, rpm, op temp, inj DC, etc, etc??

Also, more info on the car: Mileage, internal engine mods, engine mount condition, elec system condition, "Spring cleaning" done????


We need more info to be able to help.

 

[WarpSpeed]

Check/replace plug wires..... insure fuel pressure increases with boost...

 

[ITSAV6]

knock

What chip-octane of fuel-condition of injectors? Chip might be too"hot"for fuel,bad batch of fuel,one inj might be partially clogged and leaning out 1 cylender causing knock(learned hard way-blew head gasket).

 

[77tech9]

Do you know a way to check your injs? I have 99k miles and i'm kinda scared of the same problem. I put some Slick50 inj cleaner a couple tanks ago.

 

[ITSAV6]

inj

Hard for shade tree to check. Get a gallon of tolulene or xylene and add to 1/2 tank and drive it out. It will clean them pretty good. With 99k it is about replacement time anyway. Buy a used set of green tops,stk flow but better design.

 

[captrob]

Change the fuel filter?

Or kink in the fuel line somewhere?

 

[ITSAV6]

fuel lines

Check the rubber fuel lines between frame&engine-they rub together.