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engine shows its overheating and loss of power and chugging
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ltw
Novice
Mar 4, 2012, 12:10 PM
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engine shows its overheating and loss of power and chugging
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Had my mechanic look at it did full tuneup wiring harness and new plugs oil etc. Also had a new thermostat installed and it is working, but truck reads cool on start up and runs great after ten minutes it reads its overheating and running very poorly chugging and loss of power. My mechanic seems to think its the engine sensor in the motor for temp screwing up the computer is telling the engine it is overheating and causing it to cut out and run poorly. Any ideas?
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 4, 2012, 12:33 PM
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Re: engine shows its overheating and loss of power and chugging
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Would help to know what the year, make, model, and engine size of this thing is.
Is the radiator full of coolant? When the temperature gauge is reading high are both radiator hoses hot? Is the air blowing from the cooling fan hot? Using an inferred thermometer what is the temperature where the sending unit screws in. Gotta make sure this thing isn't overheating for real because if it gets hot enough, the engine will chugg, detonate, and shut down.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 4, 2012, 12:33 PM)
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ltw
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Mar 4, 2012, 12:38 PM
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Re: engine shows its overheating and loss of power and chugging
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Brand new coolant engine is getting cooled rad hose is cool then thermostat opens becomes warm engine does ping when cooling but my mechanic swears its not overheating.
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ltw
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Mar 4, 2012, 12:39 PM
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Re: engine shows its overheating and loss of power and chugging
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Ford f150 4.2 v6 2002
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Discretesignals
Ultimate Carjunky
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Mar 4, 2012, 12:48 PM
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Re: engine shows its overheating and loss of power and chugging
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Your mech needs to measure the temperature of the metal at the sending unit to confirm if the sender and/or gauge is actually correct. Verify there are no coolant leaks using a cooling system pressure tester. Verify there is no combustion gasses getting into the coolant system.
With the engine at operating temperature, both radiator and both heater hoses should be hot, not warm. Make sure the fan clutch is operating properly.
The 4.2L were notorious for leaking lower intake gaskets. When those gaskets leak, they can hydrolock the engine and break rods.
You want to make absolutely sure you don't actually have an overheating condition. If you are positive that you don't have an overheating condition, the mech should be able to tell if the engine coolant temperature sender isn't sending the correct signal by watching the ECT PID on the PCM datastream. Are there any diagnostic trouble codes?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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ltw
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Mar 4, 2012, 1:03 PM
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Re: engine shows its overheating and loss of power and chugging
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Yeah the codes read its overheating hes positive the engine is not overheating. If the sensor in the engine is screwed would it compensate the engine by trying to shut it down hence the chugging thats what he seems to think.
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Discretesignals
Ultimate Carjunky
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Mar 4, 2012, 1:25 PM
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Re: engine shows its overheating and loss of power and chugging
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What was the trouble code number? There are two temperature sensors on this engine, so it is important your looking at the correct one.
If the cylinder head temperature sensor (CHT) detects an overheating condition, the PCM will go into temperature protection mode to cool the engine off. When it does this, the engine will run like a bag of crap because it is cutting out injectors to lower combustion temperatures.
The cylinder head temperature sensor actually measures the temperature of the metal of the cylinder head. The ECT measures the temperature of the coolant.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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ltw
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Mar 4, 2012, 1:40 PM
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Re: engine shows its overheating and loss of power and chugging
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yeah he told me there are two cam and block sensor he has ordered the block sensor hopefully thats it but it does run like a bag of crap once its overheating
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ltw
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Mar 4, 2012, 2:42 PM
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Re: engine shows its overheating and loss of power and chugging
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If this is the problem my mechanic told me it was safe to drive truck what do you suggest?
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MarineGrunt
Enthusiast
Mar 4, 2012, 5:19 PM
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Re: engine shows its overheating and loss of power and chugging
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He may very well be right, but if he hasn't taken the actual temperature with an infared thermometer like suggested, he really can't guarantee it and that could be one very expensive mistake. There's noway I would take that chance.
I have a 2002 Chevy Venture with a 3.4 which is also notorious for intake gasket failure. Mine started acting up pretty much like yours. The temperature guage said it was overheating. To be honest, the engine didn't seem all that hot. The radiator hoses were warm or somewhat cool to the touch. I figured it was the thermostat and continued driving it for a few days but would pull over and shut it down if the temp crept too high. I installed a new thermostat and was still having the same issue. Finally the intake blew a leak that I could see so I knew for sure what the problem was. If I would've been told the same thing and the intake wouldn't of blown, I may have ended up needing new heads and possibly a new engine. Instead, all it cost me was about $120 in parts including oil, filter and antifreeze. That beats the heck out of over $1000 and that's doing it myself.
I'm not saying you're having the same issue but it is something to think about and especially the money that could be involved if he is wrong.
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