CEL and no EGT's...WTF?

[Silverspyder]

kind of a weird problem just sprang up with my car. When my car is cold (like in the morning) and I start it up and drive it I have no problems, but when I turn it off and restart it maybe an hour or so later it has a really 'lumpy' idle for lack of a better word. I also get a CEL and my EGT's do NOT go up at all.

When I drive it like this I can make boost, but the car gets really shaky no matter if I'm making boost or not. Then after a little while like this it will sort of "hiccup" and the CEL turns off, my EGT's shoot up to normal temps and it drives/run normally...though it's been taking longer each time to get back to normal.

The idle speed itself is fine during this too. Rock solid at 750 rpms. I wouldn't this this is a bost leak, as it makes boost just fine and that shouldn't affect my EGT's. There's no dimming of the lights or anything either...

This one's really throwing me for a loop...got any ideas????

This is on my '92 Talon TSi

 

[alex99gst]

Most of the time if I get a weird CEL if I just reset the ECU it will fix it. It's just a start though.

 

[Lordpaxin]

How far do your egt's Dip.

If you were having a problem with the Cyl you are reading EGT from, that would explain rough running, No egt reading.

check the plugs wires and coils.

Next time its doing it pull the plug wire out of that cyl and see if it does anything. if Not, there lies your prob

 

[Silverspyder]

The EGT's don't go up AT ALL when I'm having this problem which lead me to believe something was going on with the number 2 cylinder...plug, wire, injector?? I was going to mess with it today and see if I could figure it out...I'll keep ya posted.

Thanks Paxin, I'll give that a try!

 

[Silverspyder]

ok, this is where I stand currently. I pulled the wires one by one seeing if anything changed while I was getting my symptoms. Got to cylinder 1 and NO CHANGE...bingo. The wire was sparking though, so it's not that or the coil. I thought maybe a bad spark plug. Changed it out with a new one and no change.

So, I'm thinking bad fuel injector now??? Anyone have any other ideas that it could be?

Thanks,
Ry

 

[Lordpaxin]

excellent excellent.

Before i started doing that spark plug thing I have never heard of anyone else doing it.

i still get lots of crap for suggesting it, but it sure works dont it?

it sounds like fuel mayn.
if you have stock450cc, ill send you one, i have like 3 sets laying around.


perhaps its in the wires though, a broken wire or a cracked wire or someting,
that in certain situations loses connection and fuel is not pumping????

mabye you can pull it apart and strip the wire back and check it as far as you can?
id hate to do that though.

swap out that injector with an injector from another cyl. and see if when the problem duplicates again, pulling the same plug wire has the same effect, if the problem moved to the other cyl, then you know its the ijector.

if its the same cyl again, in the wiring.

 

[Silverspyder]

OK, I went and bought an analog multimeter and tried pulling the CEL and this is what I got...anybody wanna help interpret it for me?

It went: S-L-L-L-L-S-L-L-L-L-S...

and the pattern repeated...is this a 41? Just wanna verify.

Thanks,
Ry

 

[Talesin]

I had a similar problem with a wonky CAS.

While it's misfiring, try taking a mechanic's stethoscope and listen to that injector. You should hear it clicking. If you don't have a proper one, use a long screwdriver. Put your ear against the handle, and touch the tip to the injector. It should give you a good steady clicking as it actuates. If it isn't clicking, then borrow or buy a 'noid' light. Unplug the wire from the injector, and plug in the noid. It should flash regularly. If it stays on solid or doesn't come on, try resetting your ECU, just to be safe. If that doesn't help, then you'll need to look for harness damage. :b

When's the last time you replaced or cleaned your injectors? Are you running at stock fuel pressure? It's most likely that one of the injectors is just getting 'stuck'. When I bought my new set, one of them came 'stuck', and a good firm tap with a screwdriver was enough to get it working properly.

 

[Talesin]

Doublepost. :b

 

[92awddsm]

OK, I went and bought an analog multimeter and tried pulling the CEL and this is what I got...anybody wanna help interpret it for me?

It went: S-L-L-L-L-S-L-L-L-L-S...

and the pattern repeated...is this a 41? Just wanna verify.

Thanks,
Ry

I was wrong and dont want to spread misinformation so I just deleted what I posted.

 

[Silverspyder]

Yes, I'm still running the stock injectors (125K miles on the car) and stock fuel pressure.

Are you sure that's a 14 for the CEL??? If it were a 14, wouldn't it be a long pulse, then a short pulse, repeat?? Or am I getting it mixed up...I thought a long pulse was 10 and shorts were 1?

What I'm confused about is why would it run perfect when the engine is "cold" (hasn't been driven for a long time) and until I shut it off, but then when I start it up again later (when it's still pretty hot), this problem pops up? That just doesn't make sense to me if it were an injector...why would it work fine for awhile?

Thanks again for all the suggestions guys!
-Ry

 

[92awddsm]

Yes, I'm still running the stock injectors (125K miles on the car) and stock fuel pressure.

Are you sure that's a 14 for the CEL??? If it were a 14, wouldn't it be a long pulse, then a short pulse, repeat?? Or am I getting it mixed up...I thought a long pulse was 10 and shorts were 1?

What I'm confused about is why would it run perfect when the engine is "cold" (hasn't been driven for a long time) and until I shut it off, but then when I start it up again later (when it's still pretty hot), this problem pops up? That just doesn't make sense to me if it were an injector...why would it work fine for awhile?

Thanks again for all the suggestions guys!
-Ry

My bad, you are right. Long pulse is 10 and short pulse is 1. Therefore, you have a code 41 which is an injector problem. Its been a long time since I had to check codes by this method so I got a little confused. I will edit my previos post.

Anyway, an injector is an electronic coil of sorts and can be affected by heat. Same thing happens with ignition coils. Once they heat up, they begin to breakdown and malfuction even if they work perfectly when cold. As stated, swap that injector to another cylinder and see if the problem moves with the injector. If not, it is a wiring problem.