A list of all things that could make a L-Jet Jerky, now with ............Pics of my troubled head Options

[jsayre914]

I have a great daily driver. 1.8 L motor with L-jet injection, and it jerks like a son of a %^$%. It has all new vacume lines, none of wich are leaking (idles smooth at 900rpm) i have blocked off the deceleration valve. It was not letting the idle come back down fast enough for my taste. New jugs rings pistons etc. It has new plugs and wires. a new resistor pack and a newer duel relay. new alternator and new voltage regulator. Valves adjusted .006/ .008 perfectly with new valve cover gaskets. It has a new fuel pump and fuel filter, and many new wiring harness. Injectors were all cleaned and new screens put in. It runs up to 5K with no problems and runs strong to about 110mph on a flat. (IMG:style_emoticons/default/driving.gif)


Whe i accelerate easy it starts to jerk the whole way. If i try to run in 2nd or 3rd it jerks the whole time even at constant speed. sometimes i will seesaw the clutch just so i dont look to embarrising.

What is the list of things to check (i want to check everything) but i feel like i checked it all and then rechecked it (IMG:style_emoticons/default/confused24.gif)


one other problem probably related, i cant keep constant power to the fuel pump through the relay, it chokes off sometimes and dosnt want to come back (PITA) so i jumped the fuel pump lead to the + coil for now. (dont be mad) (IMG:style_emoticons/default/rolleyes.gif)

[jsayre914]

i am still a newb here. Thanks for the advise rich.

I actually adjusted the valve to .006 and fired it up and let it idle for about 15min. it still has enough compression that pulling the injector lead made the engine studder noticably. If i have lost a valve seat, why when i search do i see so much carnage, and my car is actually running the same as it was before this incident? since i adjusted the intake the sound is gone, and i even took it around the block 2 times with no problems.

am i playing with fire here. Mabey it is not the seat?
(IMG:style_emoticons/default/confused24.gif)







(IMG:style_emoticons/default/blowup.gif)

[Bartlett 914]

i am still a newb here. Thanks for the advise rich.

I actually adjusted the valve to .006 and fired it up and let it idle for about 15min. it still has enough compression that pulling the injector lead made the engine studder noticably. If i have lost a valve seat, why when i search do i see so much carnage, and my car is actually running the same as it was before this incident? since i adjusted the intake the sound is gone, and i even took it around the block 2 times with no problems.

am i playing with fire here. Mabey it is not the seat?
(IMG:style_emoticons/default/confused24.gif)







(IMG:style_emoticons/default/blowup.gif)

When a seat drops, it is no longer tight in its position in the head. It can drop and be crooked holding the valve open. It can also drop back into it's position and seal somewhat. This can repeat over and over. Sometimes it will seal and sometimes not. I had this on a 2.0 that must have gone on for quite a while. The spot for the seat was worn huge! this did not happen overnight.