Running on 3 cylinders

[DSM_Newblet]

Hey guys I just started having this issue with my car, after about 30min of driving and a little overheating my car will run on 3 cylinders and run very lean. I've narrowed it down to cylinder 1 by unplugging the injector connection. The weird thing is that it will happen randomly and then I can just turn my key off then on again and it will run on all 4 cylinders for the next 1-6min. It happens most frequently on the highway. I have 1000cc injectors with less than 2000miles on them. I am getting spark in all 4. It only happens after about 30min of driving so there is no issue at start up.

 

[zanderson]

When it happens check for spark out of the coil pack for that cylinder. I bet it has something to do with heat. I have seen simillar problems to this before.

 

[LiquidX]

Are you getting a check engine light for it at all?

 

[DSM_Newblet]

When it happens check for spark out of the coil pack for that cylinder. I bet it has something to do with heat. I have seen simillar problems to this before.

Like I said, I'm getting spark to all 4. I have a feeling it is the injector or injector connection. How do I test those things?

Are you getting a check engine light for it at all?

Not sure because I always have a check engine light on for an o2 sensor. I if I did have a check engine light what could that mean?

 

[bryanwheat]

Go rent a noid test light set from the parts store to test for proper injector pulse. Also do a compression test.

 

[Archer Fabrications]

check your injector plug wires, both of mine came out on inj #1 and its a pain in the ass to get back together so much so id almost rather replace the whole harness.

 

[DSM_Newblet]

I noticed today that it only happens on the freeway from 55-80 mph. That is the only time it will happen now. It never does it on normal streets just freeway speeds. It also throws codes P1500 - alternator "FR" terminal circuit and P0300 - random cylinder misfire. and I can still turn the key off and right back on to fix it.

 

[snowborder714]

Are you running a 1g CAS?

If so, please search. This issue (and its resolution) are all over this forum.




If not, post up a log as this will tell more than you have.

 

[DSM_Newblet]

Are you running a 1g CAS?

If so, please search. This issue (and its resolution) are all over this forum.




If not, post up a log as this will tell more than you have.

I am running a 1g CAS but am having trouble finding the solution. What should I look up? I've tried searching for a lot of things but can't find out the answer.

 

[snowborder714]

Here's two threads about it. Look for my posts.
http://www.dsmtuners.com/forums/mai...misfire-code-while-driving-randomly-read.html
http://www.dsmtuners.com/forums/newbie-forum/421313-1g-cas-98-eclipse.html

 

[DSM_Newblet]

Here's two threads about it. Look for my posts.
http://www.dsmtuners.com/forums/mai...misfire-code-while-driving-randomly-read.html
http://www.dsmtuners.com/forums/newbie-forum/421313-1g-cas-98-eclipse.html

But why is the P1500 - Alternator "FR" terminal circuit code coming up when this happens?

 

[snowborder714]

Probably a separate issue.

 

[ChrisTheBuilder]

My car has the exact same issue, I have yet to fidure out what it is, but unplug your tempature sender for the computer and it will stop for noe. I just put a toggle switch for cold starts and once it warms up I turn it off. Only because it was never a big deal to me but I also would like to get to the bottom of it.

I thought it was in the stock ecu, but then I got link, it quit for a few weeks and started doing it again. It shuts off the injector for some reason.