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  #1  
Old 09-17-2012, 06:20 PM
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Default bad engine coolant temp sensor?

so im pretty sure i have a bad engine coolant temp sensor. i have trouble starting it when the truck is warm or it is warm outside if its about 40 or lower it starts great but above that it doesnt i havnt noticed any black smoke but thats probably because of the glasspack i have directed under my truck and the tip is all black so im assuming its running rich and i can smell it running rich. so im pretty sure this is the problem but it runs great after it runs for a couple of mins and starts up good if i start it within a few mins of shuting down. so what do you guys think? is this the problem if so where is the sensor? i found one but i think its the one that runs my gauge. so where is the one im supose to replace and what would it be called so i can buy the right one.
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  #2  
Old 09-18-2012, 07:16 AM
Psycho Pete
 
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Default Re: bad engine coolant temp sensor?

really should check for ignition or coolant temp sensor codes in stored memory to verify; the ECT is also testable versus temperature, but tricky to do. Check on oldfuelinjection.com

The ECT is on the passenger side in the lower intake manifold, sort of next to the coolant neck.
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  #3  
Old 09-18-2012, 04:42 PM
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Default Re: bad engine coolant temp sensor?

i did do a test on it a while back and it gave me a cyl 6 and the guy at the parts store just said either its not firing or you obd 1 system is just malfunctioning because that happens alot. and its always ran great just hasnt been starting very good lately but getting better with this cold weather
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  #4  
Old 09-19-2012, 11:33 AM
Psycho Pete
 
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Default Re: bad engine coolant temp sensor?

check your FPR. The vacuum line connects right above the #6 cylinder, when the FPR ruptures, raw fuel gets into the engine through the vacuum line.
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1993 Ford Tempo 2.3L OHV HSC Auto - D/D Stock.
1999 Honda Accord VTEC Auto
2002 Dodge Caravan - 3.3L Auto
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  #5  
Old 09-19-2012, 11:44 AM
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Default Re: bad engine coolant temp sensor?

The coolant temperature sensors have absolutely nothing to do with starting or running in this manner.

Please define "I have trouble starting it". That tells us nothing at all about your problem.
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  #6  
Old 09-19-2012, 07:57 PM
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Default Re: bad engine coolant temp sensor?

hard starts can be caused my the engine coolant temperature sensor on this particular engine management. I have seen it before, I wasted too much of my life with this engine. This may not be the case on later model engine management systems, but this seems to be common among 2.9Ls. But like I stated, he needs to pull codes and pay attention to ECT and ignition related codes. Rich on #6 is commonly blown FPR due to where the vacuum line connects up to the upper intake, though.
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1987 Ford Ranger Short Bed 5.0L/T-5 Project
1988 Ford Ranger Long Bed Parts Truck
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1999 Honda Accord VTEC Auto
2002 Dodge Caravan - 3.3L Auto

Last edited by Psychopete; 09-19-2012 at 08:03 PM.
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  #7  
Old 09-20-2012, 09:58 PM
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Default Re: bad engine coolant temp sensor?

So when I go to start it in the mornings when it's cold it starts great but when I try to start it when it's warmer outside or after running it a lil it takes a few cranks like 5 or 6 when i shut it off for more than about 10 mins, or its above like 70 degrees, but if i shut it off and start it within 3 or 4 mins it starts right back up It's always started for me but its kinda embarrassing that it doesn't start right up and I guess it could be a fPr cuase I did a fuel pressure test and I only had like 30 psi so I was assuming my pump was starting to fail cus it was makin funy noises and low pressure so I replaced it and never checked again but it always runs great! Thanks for the feedback guys
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  #8  
Old 11-23-2012, 07:02 PM
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Default

My truck had a lot of trouble starting and idling when it was cold. I would have to hold the gas pedal half way down just to keep it running until it warmed up. It was a bad ECT sensor. The ECT sensor tells the computer the engine temp and adjusts the IAC valve depending on the temp of the engine.

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