This is topic Misfire help!? Update... in forum Tech Talk at Northern California Ford Owners  .


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Posted by Pure Stang (Member # 7251) on :
 
It's a 89 lx. Car gets a misfire randomly then goes away. Feels like someone pulls a spark plug wire and loses all power. Not sure what it can be. Cap and rotor look good changed the plugs. Any help would be appriciated. Thanks

Update. Changed cap rotor cleaned the Maf sensor, and it's still doing it. I'm running fuel injector cleaner again. Maybe it's that dirty [Confused] ... Happens random. Only other things I can think of now is bad injector or injectors, distributor or ?????... Kinda running out of ideas.

6/12-
Ran fuel injector cleaner twice. Ran real good now it's back again. Usually happens when I punch it from 1st-2nd. Maybe it floods itself? It's weird... Fuel pressure is at about 37. A little lean but seems more responsive at that level.

[ June 12, 2012, 07:41 PM: Message edited by: Pure Stang ]
 
Posted by SLOWFOX (Member # 11067) on :
 
Maf bro same issue here pull out and buy maf sensor cleaner and baam....or if you still have your msd box plug it up and see if it hlpz..
 
Posted by Pure Stang (Member # 7251) on :
 
Yeah I think I have the cleaner somewhere. And I sold the msd box. Should have kept it lol... I'll clean it hopefully that helps.
 
Posted by SLOWFOX (Member # 11067) on :
 
Daam yea check to see if your plugs arent broken from the porcelen. If you want you can barrow mine msd box as my cars tranny blew and I dont move it hit me up if you wanna try that..
 
Posted by 90 7up lx (Member # 10304) on :
 
maybe tfi modual it may be bad

im haveing misfire issues w myne
 
Posted by Pure Stang (Member # 7251) on :
 
TTT
 
Posted by nitrous_bob (Member # 77) on :
 
do a cylinder balance test. takes about 5 minutes then you can rule out the injectors hopefully

jumper wire the EEC test port like your gonna do a KOER test(might as well do a KOEO and check those codes) , but then when you start it, after the test starts, jab the throttle to get it rev to about 3000

then it will do the test.

if you get a 1-9 then all is good. otherwise it will give you the cylinder(s) that are weak

also what plugs ? and what gap

you should be using stock coppers NO PLATINUM or other funky stuff

gap them about .046" NOT .052"
 
Posted by Pure Stang (Member # 7251) on :
 
Car had platinums and I put regular autolites. They are gapped correctly. I'll run some test or have someone do it when I get the chance.
 
Posted by Pure Stang (Member # 7251) on :
 
Ran fuel injector cleaner twice. Ran real good now it's back again. Usually happens when I punch it from 1st-2nd. Maybe it floods itself? It's weird... Fuel pressure is at about 37. A little lean but seems more responsive at that level.
 
Posted by SLOWFOX (Member # 11067) on :
 
If u wanna borrow my box lmk bro also try octane booster bro lucas is cool but 108 octane booster works best see if this helps check ur timing aswell ur cap rotor
 
Posted by SLOWFOX (Member # 11067) on :
 
O yea fuel filter....
 
Posted by Pure Stang (Member # 7251) on :
 
Fuel filter is changed new cap and rotor. I would like to try that msd box idea, but it's random. I won't know if it works unless I drive it around a little. It may take 1min to find out or a couple days [Frown]
 
Posted by 93 twintrbo (Member # 10475) on :
 
Like mentioned above you may want to run a cyl ballance test. If you dont know what cylinder is dropping out (if its consistent), it can be rather hard to pinpoint. I would recommend that when it acts up, either pull a plug wire or injector clip to find the cylinder that has the miss. Once you know that you will be able to fix it allot quicker. If could be an injetor issue. I've had cars where when the injector heats up the internal resistance goes up, causing the ECU driver to shut down to protect itself.

Lawrence
 
Posted by S351-R (Member # 1605) on :
 
The ignition pick-up inside the distributor can cause random mis-fire issues. Remove the cap and rotor and check that the pick-up is not broken or loose and that the exciter ring is also not loose. Some of the common issues I've seen is that the spot weld that attaches the exciter ring to the distributor drive shaft is cracked or broken allowing the exciter ring to wobble. This can lead to a poor or incorrect ignition pick-up signal resulting in a misfire.

[ June 21, 2012, 07:40 PM: Message edited by: S351-R ]
 
Posted by Pure Stang (Member # 7251) on :
 
I'm going to check that out. I have another dist that I know it works.
 




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