Recent Topics
Who runs a 20wt here?
by StevieC. 09/21/18 07:31 PM
Need help on edit profile
by jetmech1. 09/21/18 06:34 PM
Oil thickness on the dipstick
by Idlewild294. 09/21/18 05:40 PM
Chinese WIX Trans filter bad, let me down..
by jetmech1. 09/21/18 04:47 PM
Gen 8 Accord rear brakes-What tool?
by fdcg27. 09/21/18 04:30 PM
Ammeters?
by buck91. 09/21/18 03:55 PM
Need Help with Double D Knockers
by user52165. 09/21/18 03:41 PM
Opinion needed....
by Duffyjr. 09/21/18 02:56 PM
2017 nissan sentra
by jahwarrior1423. 09/21/18 02:47 PM
I Need A Safe Space- lol
by Zee09. 09/21/18 02:29 PM
Liqui Moly
by dawgn86. 09/21/18 02:10 PM
Valve issues
by kawie_guy. 09/21/18 01:54 PM
2018 Elantra SE
by wolf_06. 09/21/18 01:36 PM
Nasty looking oil filter
by atikovi. 09/21/18 12:43 PM
Laughing hard.
by StevieC. 09/21/18 12:26 PM
Apologies
by Drew99GT. 09/21/18 12:15 PM
Would Like the Manual Transmission to Make a Comeback?
by Speak2Mountain. 09/21/18 11:39 AM
Newest Members
JRMFt11, Navyretired, aikwae, ScottRousell, Direct_Rejection
66036 Registered Users
Who's Online Now
99 registered members (4WD, aquariuscsm, A310, ABomb369, 10WSmuckers, 15 invisible), 1,623 guests, and 36 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics290,790
Posts4,850,420
Members66,036
Most Online3,590
Jan 24th, 2017
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
Truck starts harder after being plugged in #4613495
12/25/17 12:42 AM
12/25/17 12:42 AM
Joined: Jan 2007
Posts: 796
El Oeste
HawkeyeScott Offline OP
HawkeyeScott  Offline OP
Joined: Jan 2007
Posts: 796
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

Re: Truck starts harder after being plugged in [Re: HawkeyeScott] #4613511
12/25/17 01:07 AM
12/25/17 01:07 AM
Joined: Jul 2014
Posts: 185
USA
jsfalls Offline
jsfalls  Offline
Joined: Jul 2014
Posts: 185
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
Re: Truck starts harder after being plugged in [Re: HawkeyeScott] #4613539
12/25/17 03:34 AM
12/25/17 03:34 AM
Joined: Jun 2012
Posts: 994
Bremerton, WA
DemoFly Offline
DemoFly  Offline
Joined: Jun 2012
Posts: 994
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.


Pushrods, please.
Re: Truck starts harder after being plugged in [Re: HawkeyeScott] #4613543
12/25/17 03:47 AM
12/25/17 03:47 AM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
S California
Gotta go with an oil sump heater.

Re: Truck starts harder after being plugged in [Re: jsfalls] #4613559
12/25/17 05:10 AM
12/25/17 05:10 AM
Joined: Jul 2005
Posts: 30,427
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,427
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.


God Bless Our Troops

Re: Truck starts harder after being plugged in [Re: jsfalls] #4613641
12/25/17 08:20 AM
12/25/17 08:20 AM
Joined: Dec 2014
Posts: 1,671
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,671
'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

Re: Truck starts harder after being plugged in [Re: HawkeyeScott] #4613677
12/25/17 09:19 AM
12/25/17 09:19 AM
Joined: Jun 2003
Posts: 17,348
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,348
Deplorable in apple valley, ca
Interesting.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Truck starts harder after being plugged in [Re: HawkeyeScott] #4613741
12/25/17 10:59 AM
12/25/17 10:59 AM
Joined: Sep 2004
Posts: 7,525
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,525
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
Re: Truck starts harder after being plugged in [Re: andyd] #4613790
12/25/17 12:04 PM
12/25/17 12:04 PM
Joined: Jan 2009
Posts: 2,377
wi
dave123 Offline
dave123  Offline
Joined: Jan 2009
Posts: 2,377
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.

Re: Truck starts harder after being plugged in [Re: HawkeyeScott] #4614083
12/25/17 06:35 PM
12/25/17 06:35 PM
Joined: Dec 2009
Posts: 25,355
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline
Joined: Dec 2009
Posts: 25,355
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.


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
Re: Truck starts harder after being plugged in [Re: HawkeyeScott] #4614090
12/25/17 06:54 PM
12/25/17 06:54 PM
Joined: Dec 2016
Posts: 453
Indiana
5AcresAndAFool Offline
5AcresAndAFool  Offline
Joined: Dec 2016
Posts: 453
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.

Re: Truck starts harder after being plugged in [Re: HawkeyeScott] #4614790
12/26/17 03:55 PM
12/26/17 03:55 PM
Joined: Sep 2004
Posts: 7,525
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,525
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

BOB IS THE OIL GUY® Powered by UBB.threads™