A list of all things that could make a L-Jet Jerky, now with ............Pics of my troubled head |
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A list of all things that could make a L-Jet Jerky, now with ............Pics of my troubled head |
jsayre914 |
Jan 17 2010, 01:43 PM
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#1
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Speed Up !!! Group: Members Posts: 3,206 Joined: 10-February 08 From: Timonium MD 21093 Member No.: 8,696 Region Association: MidAtlantic Region |
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 |
Jan 17 2010, 06:32 PM
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#2
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Speed Up !!! Group: Members Posts: 3,206 Joined: 10-February 08 From: Timonium MD 21093 Member No.: 8,696 Region Association: MidAtlantic Region |
thanks for the pic, tell me more about what i am looking at. It looks like an alien space ship control modulator (IMG:style_emoticons/default/blink.gif)
is this what it should look like. or what part is not right. and wich way did you bend it. sorry (IMG:style_emoticons/default/chair.gif) |
zonedoubt |
Jan 17 2010, 11:57 PM
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#3
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Canadian Member Group: Members Posts: 668 Joined: 14-May 03 From: Vancouver, BC Member No.: 696 Region Association: Canada |
thanks for the pic, tell me more about what i am looking at. It looks like an alien space ship control modulator (IMG:style_emoticons/default/blink.gif) is this what it should look like. or what part is not right. and wich way did you bend it. That's what's underneath the square black cover on the AFM. The way it look sin the photo is the way it's supposed to be. In my particular case, the contact with the dog-leg on the end was bent so that it occasionally got caught when the flapper opened up. Basically, this shut off the fuel to the injectors when fuel was needed most (e.g. more air coming thru the AFM). So under acceleration, it would bog down and go jerky. It's worth a quick look under this cover to see how things work while manually pushing the flapper. Other than that, tcheck he usual suspects: vacuum leaks, timing/dwell, dizzy advance. Lots of good advice above. I also used this site for troubleshooting my L-jet: http://manuals.type4.org/ljet/ |
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