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914World.com _ 914World Garage _ What could it be?

Posted by: nebreitling Nov 22 2003, 08:31 PM

Hi all

i've had a bucking problem that started about a week ago, can't seem to figure it out. it happens all over the RPM range, at any throttle position, warmed up or cold. power is down, fuel consumption is up, and there seems to be an inordinate amount of water coming out the tail pipe.

what i've done:

-check dwell (good)
-check timing (good)
-adjust fuel pressure (to a steady 30psi)
-replace CHT [TS2] (this was a bitch but here's a tip: i made a modified socket driver (with room for the wire) out of a solid piece of oak wood -- worked like a charm!)
-filled up with 91 octance gas and STP red fuel treatment (thought it may have been bad gas)

at first, it ran much better (for like 15 minutes). but after shutting it off for 2 minutes, it began to studder and buck again like before -- as if running on only 3 cylinders...

tomorrow i'm going to take a look at the injectors, maybe tear into the dizzy.. any other suggestions?

to this board, i bow down....

nathan

Posted by: nebreitling Nov 22 2003, 08:32 PM

btw

also opened up the TPS -- still looks good.

nathan

Posted by: redshift Nov 22 2003, 08:34 PM

Does any of this help you?

http://www.914world.com/bbs2/index.php?act=ST&f=2&t=6776

Mine was acting up today.

M

Posted by: seanery Nov 22 2003, 08:40 PM

make sure all of your injectors are connected properly, sounds easy, is easy. I had that problem once with my 74 2.0.
easiest fix yet!

Also, is your fuel filter good? Low fuel can bring the crud out of an old, rusty tank. Try not to get below 1/4 tank and it'll help.
My 72 did this last week, luckily I knew the symptoms as my 356 used to do it under 1/3 tank. Fill it and give it some carb/fi/fuel cleaner and it'll fix it if that's the problem.

Posted by: SirAndy Nov 22 2003, 09:34 PM

check the grounds. where the white wires ground to the engine-block.

check yer spark plugs. and the plug-cables. make sure none is loose.

points. do you still have points?

was the fuel tank really low about a week ago?
like, you almost ran out of gas? if so, replace the fuel filter. it might be clogged up.

Andy

Posted by: john rogers Nov 22 2003, 09:39 PM

Injection points in the distributor need replacement.

Posted by: Brad Roberts Nov 23 2003, 05:37 AM

What John said.

Trigger points are bad. Seen it about 5 times this year.

B

Posted by: nebreitling Nov 23 2003, 03:39 PM

Thanks, guys

i'll crack open the dizzy and change the fi trigger points. might as well change the fuel filter, too... i appreciate the advice.

n