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EGT's have gone up. Suggestions as to why?

B

beyondloadedSE

Hard-core CEG'er
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Sep 29, 2000
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Louisville, Ky
Okay, heres the deal. Around normal cruising conditions at 70 mph, my EGT's have always been ~800F. However, over the last couple months, I noticed a weird exhaust note, as if there is an exhaust leak. At least that was my first inclination. However I'm now beginning to think the timing is off or part of the ignition system is bad. Whatever it is, it just doesnt sound the same. Anyways, the EGT's have also gone up as a result. At about 70 mph, the EGT's have raised to about ~900-950F. Something seems off here. Also, under full boost (16 psi) the steering wheel begins to shake when about 5,000 rpms and above. It's never done this before. Im guessing this is the engine sputtering and translating the vibration to the steering wheel. My question is, how likely is the timing to now be off? I cant see it hopping a tooth on the chain. Is it more likely its a coil pack or part of the ignition system. Could a bad coil pack/wires/plugs cause the EGT's to rise? As always, TIA!
 
i would think incomplete burn would result in lower egts due to raw fuel cooling the exhaust,, unless your probe is after a cat in which case the raw fuel would get an afterburner effect though the cat,, where is your probe at. when i had my custom turbo on my 93 Probe Gt i had the probe right in the manifold and that resulted in 1100* egts N/A and about 1350* when cranking out 7psi.

but if it is spitting and sputtering i would definety check plugs and wires,, pull the plugs and make sure you don't have a buch of detonation material all over one or more of them.
 
plugs were just changed less than a 1000 miles ago. I actually changed them right after I noticed the different change in exhaust note and the problem still persisted aftewards.
 
beyondloadedSE said:
plugs were just changed less than a 1000 miles ago. I actually changed them right after I noticed the different change in exhaust note and the problem still persisted aftewards.
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It sounds like you have multiple issues that could be compounding each other and making it hard to diagnose. Your tuning could also be a bit suspect.

If you can take a datalog of your car with all the pertinent data then I'll look at it when I get time.
 
Tom im thinking the tune is okay. I mean, I dont think the tune would change all by itself? Its been fine for almost 2 years now until the last couple months. I doubt I'll be able to get ahold of someone with a datalogger since nobody has one that I know of in the fort wayne/indy area, but if I do, ill be sure to send it to you. ;)

Would it be correct to assume though that if the coil pack/wires/plugs are acting up that the EGT's would decrease instead of increase? If thats the case, im thinking the timing has somehow managed to get off. Hopefully those metal shavings in the oil pan werent from the valvetrain.
 
Jim,
I'm no Xcal2 guru, but I think you can use one from anybody's vehicle, to do some datalogging. I'll let Warmonger chime in with that. And Tom, if Jim could use my Xcal2 for datalogging, what else will he need? I don't have a laptop, and I don't think Jim does either. Will the fact that I have a 2000 SVT, and him having a 96 SE, be any problem?

Mark
 
Y2KSVT said:
Jim,
I'm no Xcal2 guru, but I think you can use one from anybody's vehicle, to do some datalogging. I'll let Warmonger chime in with that. And Tom, if Jim could use my Xcal2 for datalogging, what else will he need? I don't have a laptop, and I don't think Jim does either. Will the fact that I have a 2000 SVT, and him having a 96 SE, be any problem?

Mark
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Just the xcal2 and the laptop. Not sure but he may have a chip and if it is pre-obd2 then not sure how well it would work.

Otherwise just slap it in and do the log onto a laptop. Yeah the tune may be fine but the datalogging would tell a lot of stuff.

THere is only two reasons why EGTs would start to climb all by them selves. The EGT thermocouple is going bad or the calibration is changing, OR it is telling the truth and the combustion process is getting hotter.
Combustion temps will go up because it is leaner normally. It can also go up because the ambient temperatures are higher but that is usually only a few degrees.

So check your fuel delivery, O2 sensors, MAF and clean the hotwire elements in it, check intercooler in case it died and now you have hot air going into the cyliders.
 
My dad has a company laptop so maybe I can use his. I'll be back in Fort Wayne in about a week so I'll send you the datalogging then. The tune has been reflashed onto the pcm so I dont have to worry about the datalogging issues with the chip. ;) Do I just need to do one WOT pull once the car is warm or what? :shrug:
 
Just let me know Jim. I've got someone that may be picking the car up in April, so I won't have access to the Xcal2 after that. Give me a call when you're coming back into town. :cool:

Mark
 
where are your EGT thermocouples located? You may have misfiring coil, or a stuck or burned exhaust valve. Anything that will allow raw fuel in the exhaust port. If fuel burns in the port or the header, you can see an increase in EGTs.
I don't know if anyone has ever seen it on a Duratec V6, but a slipped cam lobe could possibly result in someting like this too.

Either way, its probably warmonger's fault ;)
 
Rara said:
where are your EGT thermocouples located? You may have misfiring coil, or a stuck or burned exhaust valve. Anything that will allow raw fuel in the exhaust port. If fuel burns in the port or the header, you can see an increase in EGTs.
I don't know if anyone has ever seen it on a Duratec V6, but a slipped cam lobe could possibly result in someting like this too.

Either way, its probably warmonger's fault ;)
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The EGT is mounted in the downpipe. I know its not the most accurate location but it does help me keep tabs on the temperature.

Mark, I'll be back in town next Monday.
 
Rara said:
where are your EGT thermocouples located? You may have misfiring coil, or a stuck or burned exhaust valve. Anything that will allow raw fuel in the exhaust port. If fuel burns in the port or the header, you can see an increase in EGTs.
I don't know if anyone has ever seen it on a Duratec V6, but a slipped cam lobe could possibly result in someting like this too.

Either way, its probably warmonger's fault ;)
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Yeah, and I've never seen the car. lol
 
warmonger said:
So far away that raw fuel combusting is probably not an issue I would guess since it is after the turbo. The turbo is going to cool the exhaust quite a bit.
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Yeah, i would agree with that. Having EGT after the turbo doesn't make a whole lot of sense to me, because it really doesn't tell you much unless you know the EGT pre-turbo too . . .
 
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