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high egts... please help

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DSMTurbo2

20+ Year Contributor
34
0
Dec 17, 2002
Traverse CIty, Michigan
Ok first off the mods:
92 laser awd 6/4
b16g
evo exhaust mani
evo o2 housing
full 3"turbo back
rewired 255lph
stock FPR (have an SX ready needs fittings)
boost controller set to 15psi
3" intake pipe
dejon turbo outlet pipe
bpr7es plugs
unhacked mas (all restricters removed)
k and N (open can)
mmcd pocket logger
i think thats about it..



so first off i understand i should have an after market FPR on there.. im working on it!! the car has been running amazing on and off... i think the knock sensor might be bad (its the original has 126k on it) i have another one i can throw in..

But my problem is>>> I have been logging and turning tthe boost up (the boost controller is a dual stage) i would flip it to 19lbs and long story short it would propel six foot flames out the exhaust... so i stopped with that... ive had it sitting at 15lbs ever since..
ive been logging and feeling allot of fantom knock (43 counts) while crusing 55mph on a strait flat road. my logs have been pretty good.. nothing drastic or scary... usually when i do a good pull i get 0-3 counts i have seen 7 a few times.

so the big issue was last night.. i did a good third gear pull.... was watching my egts started around 4500 when i first hit 15lbs then held at about 5000 then all the sudden spiked up to im guessing around 7000-7500 and the car just started pulsing (i wonder why)... i happened to be logging at the time and when i reviewed the log i noticed somthing odd that i believe was at the same time all this occured here was what i got:

fuel trims:
L: 139.8
M: 96.8
H:92.1


just before the weirdness:
RPM: 5687
02: .82
INJ PW: 19.45
knck: 22
TPS: 99.6

first start of the weirdness:
RPM 5875
o2 .76
INJ PW: 11.51
Knock: 43
TPS: 99.6



worst spot in o2's

rpm: 5812 (dropped even thow i was trying to accelerate.. the pulsing??)
o2: .00 !!!!!!!! (not good!!) thats right 0.00
INJ PW: 13.31
knck: 42
TPS: 99.6


Now before this log i thought maybe i was getting some unburnt fuel from maybe some bad plugs... and it was just causing a little hesitation (since i didnt have any knock during a pull) but now im really lost... any help in pin pointing this.... im headed out to check and prolly change my plugs right now... but with those o2's im really confused... please help me.. sorry for the long story.
thanks, Erik.
 
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Why do you think your knock if phantom knock & not the real thing?
Have you checked your combustion chambers for carbon deposits?
It should be obvious that your timing is being pulled hard.
I think it's safe to assume that this is what caused the 6-ft tailpipe flames & high EGT. Try turning down the boost & see if it gets any better.
 
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Well i understand what you are getting at... im sure this has to be phantom knock just plainly for the fact that i only get it when it feels like it and its only when im cruising on level ground at a constant speed... if i was getting tons all the time (like when i was doing a pull) then i would be a little worried... the car usually pulls like a dream and the logs are usually perfect... its just this instance that i noticed things got real crazy... oh and my egts are usually within check as well.....

I have not checked the combustion chambers yet.. i didnt even get to check my plugs tonight like i thought i was going to ....

as for telling when timming is being pulled.... yes i can tell by seat of the pants for sure... but like i said i only really notice it when i feel it start to hesitate (not actually hesitate but pulse a bit) and then i try to mash my foot to the floor and the car just falls on its face..

i only got the big flames out of the car when i was doing a log at 19lbs... i have not tried that again since and have not really noticed it anymore... i say not really cause i think i have had it happen a few times but not nearly that bad.. i see it more as unburnt fuel.. im just not 100% why...

all in all i dont think it would be a problem of running too much boost... well since my egts, o2, fuel trims, inj pulse widths and knock counts are usually spot on almost perfect..

i did notice a huge clue when i was driving around tonight... i was slowing to a stap and my CEL snapped on and back off again... i left the stop sign and there was a little mis.. i slowed again.. took off and it did it again... no CEL again.. i imediaty ran the code and got a ignition coil in stored memory... i could totally see this being all my problems...

my thought is... (unburned fuel igniting in the exhaust manifold = high egts... all that unbuned fuel = knock... the only thing that still is killing me is why did my o2's drop to zero.... that cant be good....


at any rate tomarrow i will be replacing the plugs with new bpr7es, i have a spare coil laying around so i will throw that in and see if there are any drastic changes....

thanks King for the info... and if anyone else has an idea... please share.... thank you.. Erik.
 
Upvote0
Are you running bigger injectors? You have fuel pump and B16g and boost turned up, but no injectors. Your O2s seem a little low, .76, .82? Are you sure you aren't detonating?
 
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im waiting on my keydiver chip.. have some injectors waiting to go in.... but like i was try to say... my o2's have been just shy of .90 usually between .87-.90.. it was my understanding that .90 was very safe.. and .87 was about perfect... i always run good quality 93.... it was just this instance that everything suddenly went weird.. thats why im so confused...
 
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Well its been a while.. still having issues... replaced the plugs... they were white and blistery.. they didnt have any damage other than natural wear (gap increased to about .43 er .043 whichever).... now that i go tthe new plugs in i noticed occasionally i have a miss on one cylinder when idling.. happens occasionaly not all the time.... i took a trip down to school and back and while i was on the freeway (75mph) i noticed that my egts were sitting between (1500-1575) got me just a little freaked.... got worse when i was cruising at 55mph on a flat open road..... so i started doing a few more logs... i have what appears to be phantom knock when im just cruising around (usually 43 counts) it comes and goes... im going to try to change the oil and maybe try some engine restore if that doesnt do it... the biggest issue im having is my high knock count doesnt seem to always pull timing.. i say not always but it usually pulls it just not very linearly.. i can have 43 counts and holding it for a while at timing will go down up down up??? might be a clue?? i replaced the knock sensor... had the original in it after 127k... didnt get any change.... my fuel trims, o2's and knock counts while at WOT are real good (normal) o2 and trims are actually showing on the rich side... still getting a little knock up in the high rpms when doing this but nothing huge (7- 10 counts at most usually 5or so)

Overall i think that with all the PKnock and the corrisponding timing reatrdation maybe that is causing the high EGT's ??? but i think i need to try to get rid of the phantom knock for now (while keeping an eye on EGT's) i hate my car... thanks for the space. Erik
 
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What type of fuel are you running - octane? I have had the same problem due to low octane fuel. At that rpm level, the knock you are getting is probably knock and not phantom knock. As I have DSM Link, i can see the retarding of the timing due to knock. Try a higher octane fuel or go cooling mist. As foe me, I have ordered a 2.4L and cooling mist to help with the low octane.
 
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it be nice if it was that easy... i run good quality 93 always... if i need more than that i have issues. but nice thought.. thanks Erik.
 
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Check your base timing. Low base timing will cause high egt's. Also, your low fuel trim needs to be extremely richened up. You need bigger injectors as well for that much psi. Turn the boost down. You say you have a logger, how about you log timing, rather than just assuming.
 
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As said before, if your logger is stating that your trims are high, then your ECU is richening things up because your motor is running too lean. Injectors and AFC would help.
 
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