Cranking before starting the engine, and overusing the fan for cooling

[Javed]

They should do a Kaiser & AMC edition as well


Back on subject....Starting the engine builds oil pressure faster than cranking.

Large single cooling fans rarely run at 100% duty cycle, You can tune a more aggressive cooling fan model without going scorched earth!

The Tazer tricks the Jeep computer by turning tranmission temp to 250 degrees and the Jeep fan goes wild, it becomes a helicopter So I am nervous that I will shorten the life of the fan or something

 

[AZjeff]

1. I press and hold brake and gas pedal, the engine cranks for like 5 seconds. Then I start my Jeep normally and it sounds so smooth and nice. What is the harm in doing that every single time?

2. I have a Tazer plugged in. Anytime my oil temperature goes above 215, I use the Tazer to run the fan at max speed, it drags my coolant temperarure from like 220 to 185 within 20 seconds, and then oil temperature creeps down to 200. What is the harm in doing that?

Your Jeep will live a long happy life if you just operate it as intended. Where did the odd starting procedure come from? What does it sound like if you don't do it?

 

[Javed]

Your Jeep will live a long happy life if you just operate it as intended. Where did the odd starting procedure come from? What does it sound like if you don't do it?

It was on Jeep forums. If I don't do it, it sounds rough for a second.

 

[edyvw]

Two quick questions

1. I press and hold brake and gas pedal, the engine cranks for like 5 seconds. Then I start my Jeep normally and it sounds so smooth and nice. What is the harm in doing that every single time?

2. I have a Tazer plugged in. Anytime my oil temperature goes above 215, I use the Tazer to run the fan at max speed, it drags my coolant temperarure from like 220 to 185 within 20 seconds, and then oil temperature creeps down to 200. What is the harm in doing that?

Thank you

1. You should try different oil if it sounds rough for a second. What oil are you using now?
2. Hot oil is happy oil. Additives do their job when oil is hot. There is no concern just letting it run as is. That fan you have is really useful only if you were doing some off roading here in CO at very high altitude, not bcs. engine oil, but bcs. transmission fluid temperature.
Just leave it!

 

[Javed]

1. You should try different oil if it sounds rough for a second. What oil are you using now?
2. Hot oil is happy oil. Additives do their job when oil is hot. There is no concern just letting it run as is. That fan you have is really useful only if you were doing some off roading here in CO at very high altitude, not bcs. engine oil, but bcs. transmission fluid temperature.
Just leave it!

It happens with all 0W-20's that I have used. Now even with HPL Super Car OW-20 that has amazing flow.

 

[4WD]

Hey, if a little rock hits this offroad, will it come off?

View attachment 293004

An impact might - anything that adds leverage can break off …
I use Fomoto’s on our Tahoes - but they are in a crossmember gap behind a skid plate - and the older one is lifted …
My Jeep looks too exposed - and it’s not hard to reach with a long handled box end

 

[Jetronic]

It happens with all 0W-20's that I have used. Now even with HPL Super Car OW-20 that has amazing flow.

but does it do it with a 30?

oil draining back to the sump is related to viscosity, oil being pumped not so much. if the viscosity doubles, the oil takes twice as long to drain back, but will pump just the same.

 

[NibbanaBanana]

It happens with all 0W-20's that I have used. Now even with HPL Super Car OW-20 that has amazing flow.

Well, that explains it. The old dinosaur wizz in the sump. Change that out to some real motor oil. 5w-30 or even better 10w-30.

 

[eljefino]

You're probably making engine noise during your extended cranking, it's just a different frequency and mixing in with the starter noise.

When fuel injection first came out, cars started right up. Then Ford engineered their 4.6 to take a minimum of four revolutions to build oil pressure and everyone else followed suit. (The start-stop cars out now start faster on warm restarts.) Why four? IDK, but it's "about right" and has been the standard for 30 years. I'd start the jeep normally and get used to the rattle.

Your tazer sounds cool, though. The engine is at its best behavior at its thermostat temp; shedding radiator, transmission, and underhood heat early won't hurt anything aside from maybe wearing out the fan motor.

 

[PontiacHO]

You get oil to the needed areas much quicker when the engine fires off quickly rather than a slow starter spin.

 

[Vercingetorix]

The concept of building pressure quickly seems wrong. You want to build pressure in the fewest number of revolutions. The quickest way to build pressure would be to redline it as quick as possible.

 

[edyvw]

It happens with all 0W-20's that I have used. Now even with HPL Super Car OW-20 that has amazing flow.

It is just than valve train. try 5W30.

 

[twX]

IMO, cranking before starting isn't usually going to be beneficial. The bearings will be just fine without oil pressure for a few seconds. At idle speeds, it tends to take around 30 seconds of oil starvation for the bearings to "dry out" and for wear rates to start to increase a lot. The only time this should be a concern is in really cold weather.

The noises you hear could be from a lack of hydraulic pressure for the timing chain tensioner or something. Above a certain rpm, you could get some chain slap if there's isn't pressure at tensioner yet. I don't think it's much of a reliability concern.

The extra cranking is going to be harder on your starter and battery.

 

[Glenda W.]

I run 0W-30 in my Jeep. Fully covers cold starts and 250f oil temps off roading. Unless you’re mall crawling 20 grade is not appropriate IMO.

Since there is no ADBV I have considered the Baxter but am reluctant. Many high mileage Pentastars out there in soccer mom vans getting started 20+ times per day.

 

[Javed]

You're probably making engine noise during your extended cranking, it's just a different frequency and mixing in with the starter noise.

When fuel injection first came out, cars started right up. Then Ford engineered their 4.6 to take a minimum of four revolutions to build oil pressure and everyone else followed suit. (The start-stop cars out now start faster on warm restarts.) Why four? IDK, but it's "about right" and has been the standard for 30 years. I'd start the jeep normally and get used to the rattle.

Your tazer sounds cool, though. The engine is at its best behavior at its thermostat temp; shedding radiator, transmission, and underhood heat early won't hurt anything aside from maybe wearing out the fan motor.

I wonder why Jeep computer gets tricked by very high tranmission temperature and runs fan at max speed. Does radiator fan cool down tranmission too?

 

[Javed]

I will make a video without cranking and you guys tell me if this is normal. Jeep has been parked for more than 12 hours and outside temp is 63 degrees. Yes it is cloudy in August

 

[Javed]

I will make a video without cranking and you guys tell me if this is normal. Jeep has been parked for more than 12 hours and outside temp is 63 degrees. Yes it is cloudy in August


View attachment 293113

 

[Ursatdx]

I wonder why Jeep computer gets tricked by very high tranmission temperature and runs fan at max speed. Does radiator fan cool down tranmission too?

Your ATF is cooled by your radiator.

 

[Astro14]

Two quick questions

1. I press and hold brake and gas pedal, the engine cranks for like 5 seconds. Then I start my Jeep normally and it sounds so smooth and nice. What is the harm in doing that every single time?

2. I have a Tazer plugged in. Anytime my oil temperature goes above 215, I use the Tazer to run the fan at max speed, it drags my coolant temperarure from like 220 to 185 within 20 seconds, and then oil temperature creeps down to 200. What is the harm in doing that?

Thank you

The problem with dragging your coolant temperature down to 185 is that you might put the ECU back into open loop mode.

You don’t state what year or model of Jeep you have but a lot of computers want to see the coolant temperature above 200 before they go to close loop and start adjusting the fuel air ratio based on the oxygen sensor input.

It sounds a lot like you’re trying to fix two things that aren’t broken.

1. Starting the car normally will be fine. No need for all this extra cranking with the throttle floor to fool the computer into cranking longer.

2. Letting the cooling system work as it was designed will also be fine. No need to trick it into trying to cool it down, just to manage your oil temperature.


If you really want to manage your oil temperature, get a thermostatically controlled separate oil cooler. It’s not hard to plumb one in.

 

[Astro14]

Hey, if a little rock hits this offroad, will it come off?

View attachment 293004

No. They’re on pretty tight. They’re stainless steel in fairly damage resistant. Certainly stronger than something made out of brass like the Fumoto.

Besides, doesn’t your jeep have a skid plate that prevents rocks from hitting things?