Egt-too Hot?

[Summit]

recently bought set of guages with new trailer purchace, running empty @80mph w cruise on up the interstate 900deg pre-turbo on flat no head wind , up hill 1100-1200*. Truck gets terrible mileage (12) doesnt have much power. in the last week new transfer pump,injector pump,injectors,turbo,reflash comp no improvments??!! Idont dare tow anything. coolant temp doesnt get hot. Ithink a geo metro could out race me. IDEAS??

 

[Summit]

sorry for the long post but too much info to give. forgot to mention that it WONT blow any smoke acts like lean condition cant figure why no fuel>

 

[SEmerson]

Tthat is hoter than me. I run 600 maybe 700 on the flat. And a lean condition would make you run cooler besides. What is your boost? More air will cool you off.

 

[JR2]

How much boost are running?? I am thinking that you are not getting enough air to the motor. There could be a number of reasons for this. Loose hoses from turbo to intercooler, mis adjusted wastegate, faulty map sensor.....

The other possibility, a dirty or faulty IAT (intake air temp) sensor can effect how much fuel is sent to the engine.

I am assuming that since you have had all these parts replaced that a dealer is doing warranty work?? Have them check the IAT. There was a thread about the IAT a while back... do a search for it. IAT's are real cheap and I would think that a dealer would be able to spot it with there fancy computer.

Good luck.

 

[RJOL]

IAT Sensor

Summit,



There is a good discussion of the IAT sensor in the latest TDR (issue 34 / page 46). Don't know if that's your problem, but it's another area to look at. Your temps seem a little high. I tow a 32' (11,000lb) fifth wheel and at cruise, 60-65mph, my temp in the 700-800 range. On a steep grade, it rarely goes above 1150.



You might want to consider adding a fuel pressure gauge to see what kind of pressures your running a different speeds/load...

 

[Ted Jannetty]

More than likely there is a boost leak check all your hoses, and intake gasket.

 

[Summit]

yes there is a dealer doing warrantywork but been to 2 shops ,not fixed yet. get 19lb boost, checked for leak in intercooler-none, less air would mean more smoke i CANT get my truck to SMOKE not even 40mph 5th gear wot. everyone who changed IAT cleared smoke problem. i tried a CPC chip and it run xactly 100* cooler empty. more fuel more timing but even with chip im slightly better power than stock. i even took truck to bully dog perf they changed prob&gauges to rule them out. boost was unchanged chiped, add elbow +2lb - 21lb. thanx for any ideas

 

[RustyJC]

21 PSI boost with a boost elbow? Admittedly ours is an ETH, but we were 22 PSI stock and 30 PSI with the elbow that comes with the Edge EZ!



Rusty

 

[Lsfarm]

What Air Filter?

What air filter are you running? Removing the stock filter and installing an Amsoil filter dropped my temps about 100*. Removing the 'snorkel ' between the filter box and the inner fender dropped another 50*!!



Try removing the snorkel first, then try another filter. If you have access to a cummins dealer, get the BHAF, it is a 5 minute install, and costs about $35 +/-. This will eliminate the intake air being the cause of your high EGT's.



BHAF p/n Fleetguard 19037, Napa AF2790 [I hope I'm right]



Just my $. 02



Greg L

 

[Dr.Kayak]

I agree with LsFarm. The Air Filter makes a big difference on EGT. Even on a stock truck. I have run the Amsoil filter and the BHAF both decreased my EGT. Given a good long grade and a WOT run with either filter I can still get my stock truck up to 1400.

 

[Todd T]

1st are you down on power or is the truck running like it always has?



you said @ 80 you are running 900F you have 35" tires and a 5" lift. those play into this "big time"



at that speed what is your boost level? i'm guessing it would be around 8-10PSI?



from a roll in second gear what is the Max boost you can achieve?



what filter are you running?



P. S. the BHAF is not the best one on the market for improving airflow, it can only flow 350CFM @ 1. 5in Hg. but in a stock configuration would achieve cooler EGT's

 

[Summit]

already put in a amsoil air filter (hiflow) didnt help-kept my chip pluged in today get a terrible bucking below 1300 rpm? doesnt do that stock??? everybody that rides in it says its GUTLESS,even the mech. if air filter was plugged would be smoke&heat,i just have heat---no smoke whatso ever. without chip 4th gear passing wot it goes right to 1300+ EMPTY. now cummins wants tech to pull timing cover check timing??? it used to run great my 26ft 5th wheel is still black from exhaust.

 

[Benson]

P. S. the BHAF is not the best one on the market for improving airflow, it can only flow 350CFM @ 1. 5in Hg. but in a stock configuration would achieve cooler EGT's

How does this compare to the stock filter and to a K&N type filter? I can't remember the numbers.



Anyone have filtering capacities for these? (Microns)

 

[Summit]

Originally posted by Dr. Kayak

I agree with LsFarm. The Air Filter makes a big difference on EGT. Even on a stock truck. I have run the Amsoil filter and the BHAF both decreased my EGT. Given a good long grade and a WOT run with either filter I can still get my stock truck up to 1400.

ARE YOU THAT HOT EMPTY???

 

[Summit]

Originally posted by Todd T

1st are you down on power or is the truck running like it always has?



you said @ 80 you are running 900F you have 35" tires and a 5" lift. those play into this "big time"



at that speed what is your boost level? i'm guessing it would be around 8-10PSI?



from a roll in second gear what is the Max boost you can achieve?



what filter are you running?



P. S. the BHAF is not the best one on the market for improving airflow, it can only flow 350CFM @ 1. 5in Hg. but in a stock configuration would achieve cooler EGT's

DOWN ON POWER-------CHANGED TO 35'S AT 19KMI VERY MINOR POWER LOSS-VERY-MINOR ILLDOUBLE CHECK BOOST AT SPEED 19LB BOOST DOESNT MATTER WHAT, WHEN ,WHO,WHY. AFE BRAND NEW

 

[Mopar-muscle]

Originally posted by Todd T

P. S. the BHAF is not the best one on the market for improving airflow, it can only flow 350CFM @ 1. 5in Hg. but in a stock configuration would achieve cooler EGT's

todd if this is the case the re-0880 doesn't flow much more , i did back to back runs on the dyno comparing a napa BHAF and my freshly cleaned re-0880 , difference was . 5 hp , that could be just how i controlled the peddle between the 2 runs .



i'm also leaning toward a boost leak. i had a similar problem when i had a blown intake gasket , it would spool up the boost but if you watched the gauge and tryed to keep boost constant it would bleed off , when running down the road at 70 constant peddle , no boost , mileage went in the crapper also .



my intake gasket was blown out between the 2 bolts on the intake horn , valvecover side .



you need to pressurize the intake tract from air intake duct end and spray everything with soapty water , this will expose the leak .



oh and if your running a VA and no boost module you shouldn't see more than 20 psi boost , if you do the computer will defuel to keep it down , if it goes above you'll get a check engine light .