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Old 08-29-2004, 09:01 AM
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Red face overheating 454

Need help, I have a 1988 3500 crew cab dually, fuel injected 454, that runs hot, even though it has never boiled over as soon as I put a load on it the temp climbs up fast so I have put in a new radiator, t-stat ( 180), exhaust (3" ),fan clutch, factory replacement first then a aftermarket one that locks u 15 deg earlier, aftermarket chip,I am also running a factory shroud, when non if this worked I put a new motor in and then I had a new chip configured ( from fast chip ) to add more fuel, I have set the timing for 38 deg full advance, ( the new motor loves a lot of timing ) this truck is for pulling a trailer ( which I cant do yet ) any ideas ????

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Old 08-29-2004, 09:13 AM
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I have a friend who had the same problem. He did almost the same things you did.

He sold the dually to a buddy. CHEAP.......

Then he changed the exhaust. Too much back pressure.

Runs great now.


Now I am NOT saying that's what is wrong with yours..........just retelling what happened to a friend in a similar situation.

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Old 08-29-2004, 09:17 AM
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hey Duce, thanks for the response, Thats on of the first things I did, I took off the two restrictive converters and the stock muff and put on the biggest converter for gas engines I could buy and a 3" system. no change in the hot dept. but it did run better. any other ideas ?
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Old 08-29-2004, 03:03 PM
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Everett,

Just thinking about your truck, you mention it runs hot but has not boiled over. How hot is hot? Any possibility the gauge or sender is the problem? Have you verified the temperature with another gauge?
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Old 08-29-2004, 04:21 PM
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i changed engines once and ended up with more power and forgot to change the sensor to match the temp of my engine.it wasn't running hot at all.the guage was just telling it was i took a small motor and computer out and no body told the guage .it thought it still had the old motor.verify the temp.

and i always drill 5/16-1/4" hole (3) in my stat to help eliminate overheat because of stat and it helps to burp the system.
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Old 08-30-2004, 07:28 AM
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Thanks guys for your responses, This computer controlled truck have two temp sensors one for the guage and one for the computer and they match, well close enough, now the last time i pulled my trailer I was going over Stevens Pass ( well atttemped ) as I was approaching the pass I was running around 210 deg f as soon as I hit the steep part the temp climbed to fats to 240 deg. f and I lost all power. I pulled over to cool the truck down several times,( you know hood up idleing on side of road like a dork ) Since then I contacted Fast Chip again and they sent me out another chip to richen up the fuel mix andI added a total of 38 deg full advance to the timeing. The scan tool tells alot if you know what is saying I am trying to find someone who knows what the sensors really mean like the idle air solinoid is pulsed by the computerand when this motor gets hot it runs the idle speed up ? what input to the computer is telling it to do that ? The knock sensor reading is it suppose to always ramp up in numbers then start over again ? what does it mean??

any help would be great.
thanks again,
Everett
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Old 08-30-2004, 11:26 AM
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you mean the knock sensor?it tells your your computer there's a problem and to readjust.and keeps telling it til it does adjust.
if you have to drive it til its fixed try using a higher pressure cap.it will take a little longer to get hot.if you don't need to drive it,disreguard.what would happen if you put a 160 stat in it?
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Old 08-30-2004, 11:31 AM
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The knock sensor input to the computer will retard the timing back until it stops getting input ( noise ) from the block. But the idle air solinoid will adjust the idle up to compensate for load like the a/c compressor but what I dont understand is what else will make it ramp up. For example after running the truck for 30 minutes or so the idle air solenoid will go from say 35 pulses to 69 pulses and the idle jumps 200 rpm..

I am not sure what a 160 stat will do..
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Old 08-30-2004, 05:06 PM
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Everett,

I sent you a PM on this subject with some additional thoughts that might help..
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Old 08-30-2004, 05:25 PM
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Hey Advance, thanks for the response, where did you send the pm? I did not get it.
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Old 08-30-2004, 06:48 PM
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Everett,

Sorry about that. Check your profile and you should have the PM there now.
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Old 08-31-2004, 03:17 PM
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Hey! a lot of us would be interested in what other conditions could cause this. I own a 92 1 ton GMC with a 454 that is keeping it's cool, but you never know what the future holds. Please keep us posted if you find the culprit. Thanks.
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Old 08-31-2004, 03:27 PM
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Will do, this has been a nightmare and a huge money pit so far, once I find it i will post it.

have a great day
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Old 08-31-2004, 05:12 PM
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Hey everyone. I figured I'd jump on a pre-post related to temperature rather than start a new thread.

Just wanted to ask when talking about water running temperatures say 190 is good and 230's gettin pretty bad

Are these temps for a sensor installed in the intake manifold or in the block?
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Old 08-31-2004, 05:21 PM
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HEY Earthworm, in mine the guage sensor is mounted in the head and the computer sensor is mounted in the intake. Now I am told that the temperature fluctuations from 180 to 230 is bad..
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