Backfire on idle only - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

Pinkee · 10-17-2003, 23:27

Gday all, ive just recently got me car up and running again after donating $200 to the international carby mechanics fund and ive hit a problem. It is that (hot or cold) the car runs fine when revving and what not, but when idling, it seems to backfire... quite a bit

now im not sure if it was doing this before as its a recent acquirement and, well yeh.

anyone got any suggestions?

btw its a 351 with a 650dp

cheers all

ebxr8240 · 10-18-2003, 05:07

Check for inlet leaks a compression test to check for bent valves or burnt, damaged valves.Plugs/ leads and timing perfect??

Pinkee · 10-19-2003, 05:30

well it just had a service so the timing and plugs are good, but ill check the compression asap

cheers.

xf351gt · 10-19-2003, 05:34

if its more of a pop than a backfire me thinks burn valve.

but check every thing ebxr8240 listed

TTNOS8 · 10-19-2003, 18:38

As above, timing.

Also check idle mixtures.

Does it backfire just sitting there, or is it when you start to put your foot down?

Pinkee · 10-20-2003, 00:00

TTN, yes it is only doing it when sitting there but come to think of it, xf is right, its more of a popping sound than anything, i think i will check the valves when i can....

just as an off note, will it be a bad thing to continue using, ie will it do mor damage?

xf351gt · 10-20-2003, 05:19

Quote:

Originally Posted by Pinkee

just as an off note, will it be a bad thing to continue using, ie will it do mor damage?

if its a burn valve or valve not closed due to rocker clearence could check the rocker clearence or wrong pushrod lenth otherwise keep driving it dies thats my moto .