Troubleshooting rough running FI

[JammerX19]

My car always runs a little rough. Even after warmed up, it has the occasional miss. How smooth is the FI 2L supposed to run? Is this something I should leave alone or can I smooth it out? Plugs and wires are new. Gonna try new rotor and cap to see what that does. Anything else?

[azruss]

should run as smooth as a baby's behind. may want to look at fuel issues. old or dirty injectors can cause rough running.

[grittracing]

or a broken injector

[JammerX19]

or a broken injector

The car runs perfectly out on the road. The miss only occurs at idle (as far as I can tell). Would a faulty injector work under load?

[grittracing]

mine did to a couple years ago till i went to back in the driveway or drive slow it would stall out there is a guy in big rapids michigan that rebuilds them but you need to send him 3 or 4 extras. he flows them and gets you a matched set within 5 % of each other for $17 per injector. or i think new are $150 or so per injector. i think the name is something like cruzin performance. i would offer to loan you a few injectors but i have already loaned them out and non was returned..

[Spiderinmlnj]

I had a rough idle problem that was caused by air leaks.
Make sure all of air hose connections are tight.


Geoff

[ga.spyder]

I am with Geoff on this.The injectors would be down on my list,after checking all connections,hoses,sensors,etc...Download a copy of Brad's Bosch f.i. manual and do the f.i. tuneup in there.Very easy and it eliminates a bunch of issues.I had the same problem back a couple years ago,and found a split in my main intake hose.Taped it up(until I got a new one)and problem solved.

[joelittel]

http://www.hiperformancestore.com/Ljetronic.htm

This is a great site about the Bosch l-jetronic fi system.

[ga.spyder]

Here is a link to the Fiat L jet f.i. guide by Brad
http://www.gomog.com/allmorgan/FiatL-Jetronic.pdf

[JammerX19]

Found a small crack in my intake hose last week so I replaced it. Man what a difference! Apparently I was getting unmetered air all this time. I'll give it a few miles to see how much of an improvement it actually is.

[joelittel]

I'm glad to hear that it might be an easy fix.

[ga.spyder]

Hey Jody..I didnt realize this was you! This is Craig N.,I go by ga.spyder on this forum.Glad to hear that is all it was.I lived with mine for a month before finding the crack in my intake hose. See you at FFO.

[JammerX19]

Hey Jody..I didnt realize this was you! This is Craig N.,I go by ga.spyder on this forum.Glad to hear that is all it was.I lived with mine for a month before finding the crack in my intake hose. See you at FFO.

Yep, very happy that this fixed it.