Todd
I have been working through all the same bits with a similar problem on a
Mazda 1600cc engine. Basically its running lean at part throttle and
backfires when cool. It runs very well at full throttle. I eventually took
it to a local tuning shop who could only find the (new) air filter was a bit
restricted. ($99 thank you) He concluded like I had that basically LRP fuel
now available is not as good as previously, and the carb secondary jet needs
to be slightly enlarged to compensate.
I would still look for a fuel starving cause.
----- Original Message -----
From: "tod matthiesson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, 6 June 2001 20:35 PM
Subject: Engine Probs
> Hi ppl
> I have an L18 with an a87 (closed),twin Su's, and ei dizzy and it is is
not
> running right. It idles fine but has developed a bad miss above about
> 2000rpm ie it starts to backfire and lose all power. I have replaced the
> rota, dizzy cap, and coil cleaned and checked the spark plugs, tried
> different leads, checked firing order, and even swaped my points dizzy
back
> in but it is still there. The timing is set to 14deg adv as per factory
> manual. I rotated the engine to tdc to check that the rota button is
firing
> no1 at the right time as far as i can tell it is.
> I then checked the fuel system and found some material blocking the rear
> carby, i believe this was caused by a tank of optimax i used and it
> dislodged some salastic(which i stupidly used where i should not have yrs
> ago oops) This lead me to suspect a lean out causing engine damage so i
had
> a compresion test done with the folowing results (#1)131psi (#2)140psi
> (#3)125psi (#4)130psi so this makes me doubt that theory as tey are all
> fairly close to one another. The car has a very butchered wiring loom so
i
> started to suspect it next so i disconected the loom from the starter and
> coil and ran my own wires from the battery to the coil and jumped the
> starter but the miss is still present so its got me beat. There is no oil
in
> water, water in oil and the exhaust is not smokey, could it be a dead
valve?
> Can anyone think of something else that could be as im becoming desperate
> ive spent a lot of time chasin this for no joy.
>
> Thanx in advance........Tod
>
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