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#4613495 - 12/24/17 11:42 PM Truck starts harder after being plugged in
HawkeyeScott Offline


Registered: 01/11/07
Posts: 785
Loc: El Oeste
Buddy’s 2002 Toyota Tundra 4.7. He’s using a lower radiator hose heater to help with cold starts this winter. But the truck has been very hard to start after being plugged in. He says it took 45 seconds of on/off cranking to start today. Water temp is just off the cold mark during hard starts. Truck starts fine when not plugged in.

Seems like the heater is doing something counterproductive. Any ideas what is going on? Web seems void of answers on this issue.

Here’s what he’s using: https://north40.com/kats-heaters-lower-r...AiABEgKy7vD_BwE

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#4613511 - 12/25/17 12:07 AM Re: Truck starts harder after being plugged in [Re: HawkeyeScott]
jsfalls Offline


Registered: 07/24/14
Posts: 182
Loc: USA
PCM uses the coolant temp sensor to adjust fuel mixture so may be too lean to start normally. Needs a richer mixture to start when cold
_________________________
2012 Mazda 5 - Havoline 0W20, Idemitsu ATF
2002 Buick Century (beater) - Whatever is cheapest
2003 Honda Civic EX - Honda Genuine oil & ATF

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#4613539 - 12/25/17 02:34 AM Re: Truck starts harder after being plugged in [Re: HawkeyeScott]
DemoFly Offline


Registered: 06/03/12
Posts: 994
Loc: Bremerton, WA
Dense air with lean fuel. He's bypassing fuel enrichment. He has a warm radiator/Coolant-temp-sensor and a cold engine block.

He'd have more success with a sump heater if his goal is engine protection. Those engines reach operating temperature within a couple of miles.
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Pushrods, please.

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#4613543 - 12/25/17 02:47 AM Re: Truck starts harder after being plugged in [Re: HawkeyeScott]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: S California
Gotta go with an oil sump heater.

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#4613559 - 12/25/17 04:10 AM Re: Truck starts harder after being plugged in [Re: jsfalls]
demarpaint Offline


Registered: 07/03/05
Posts: 29796
Loc: NY
Originally Posted By: jsfalls
PCM uses the coolant temp sensor to adjust fuel mixture so may be too lean to start normally. Needs a richer mixture to start when cold


Bingo. I'd try an oil pan heater, my bet is he will probably eliminate the problem.
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#4613641 - 12/25/17 07:20 AM Re: Truck starts harder after being plugged in [Re: jsfalls]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
Originally Posted By: jsfalls
PCM uses the coolant temp sensor to adjust fuel mixture so may be too lean to start normally. Needs a richer mixture to start when cold


Yup

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#4613677 - 12/25/17 08:19 AM Re: Truck starts harder after being plugged in [Re: HawkeyeScott]
Chris142 Offline


Registered: 06/05/03
Posts: 16835
Loc: Deplorable in apple valley, ca
Interesting.
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#4613741 - 12/25/17 09:59 AM Re: Truck starts harder after being plugged in [Re: HawkeyeScott]
andyd Offline


Registered: 09/25/04
Posts: 7158
Loc: Marshfield , MA
How cold is the temp that you feel outside heat is needed to start the truck?
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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#4613790 - 12/25/17 11:04 AM Re: Truck starts harder after being plugged in [Re: andyd]
dave123 Offline


Registered: 01/13/09
Posts: 2315
Loc: wi
Originally Posted By: andyd
How cold is the temp that you feel outside heat is needed to start the truck?
I like to know also -20F might be the temp I'd start looking to plug in. I have started at near -30F on a few vehicles not plugged in overnight slow but ok.

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#4614083 - 12/25/17 05:35 PM Re: Truck starts harder after being plugged in [Re: HawkeyeScott]
Garak Offline


Registered: 12/05/09
Posts: 24620
Loc: Regina, Saskatchewan, Canada
I'll pull a Merk and say he got his plug backwards, reversing the polarity, causing the block heater to cool things off. wink

In all seriousness, the oil pan heater might be a good suggestion. These little "problems" have started to manifest themselves here over the past number of years, too.
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Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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#4614090 - 12/25/17 05:54 PM Re: Truck starts harder after being plugged in [Re: HawkeyeScott]
5AcresAndAFool Offline


Registered: 12/18/16
Posts: 421
Loc: Indiana
I had the same problem about 20 years ago with a 1987 Ranger 2.9L EFI. I put in a 1200 or 1500 watt tank heater that hooked to the block using a fitting on the side of the engine block and one of the heater hoses, used convection to heat the block. It worked well, but when it got around zero what would happen is the ECM was reading a higher coolant temperature and using a fuel mixture for a warmer start.

It acted up and started hard.

Never did try to find away around it, but I was going to wire a switch that would bypass the coolant temperature sensor and hook to a resistor that was equal to the resistance of a coolant temperature reading at zero.

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#4614790 - 12/26/17 02:55 PM Re: Truck starts harder after being plugged in [Re: HawkeyeScott]
andyd Offline


Registered: 09/25/04
Posts: 7158
Loc: Marshfield , MA
It makes perfect sense to me. Plug in htr is fooling ECU into thinking the engine is warm. Wabbout a toggle switch to open lead to ECU ? Or an electric thermo time switch Set it for 10 seconds of open before normalizing. Kinda sorta what the earlier 528e s used in the cold start stuff.
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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