Possible solution to engine rattle at start-up (1 Viewer)

[450 Cruiser]

Has anyone installed an ignition-defeat switch in order to crank the engine 'til oil pressure builds? I use a similar method with my '67 mustang that I don't drive very often by not (manual) choking it. Crank it for 10seconds, at which time the oil pressure light goes out and I'm sure there's oil in the journals, then engage choke.

Would installing the switch throw a code everytime you defeated the ignition?

 

[firetruck41]

Not sure about that method, but another option is installing a pressurized pre-oiler. There have been threads on that subject, but I don't think anyone has actually done it yet.

 

[cruiserdan]

Killing the spark does not kill the EFI so you will have the injectors fire and it will richen up a bit. In experiments I have tried it only takes 2-3 seconds of cranking to avoid the rattle but I have not rigged any sort of bypass to either kill the spark or the fuel. In testing I have pulled the coil wire. I think what I would do is interrupt the primary voltage to the coil (I have NO idea what the ramifications of that would be by the way so you are on your own there).

 

[RavenTai]

there are two here that have pre-oilers, Photoman has an accusump, someone else here, I forget who assembled his own.

killing the ignition will lead to unburnt fuel, wasting of usable fuel, washing of the cylinders witch will elad to ore wear, more fuel dilution in the oil, might also be harder on the O2's and cats, the extended crank would be harder on the starter and battery,

I think the preoiler would be a better route,

 

[cruiserdan]

The "extended crank" is only 2-3 seconds on a cold motor.


I just had a brain storm.....



Wire a "remote start" such as the type used for engine servicing in which power is provided to the solenoid only and the ignition and fuel systems are left out.
One would push the magic button and the starter would spin whilst everything else remained off. As long as the button is pushed with the key off the engine will not attempt to start.

 

[450 Cruiser]

there are two here that have pre-oilers, Photoman has an accusump, someone else here, I forget who assembled his own.

killing the ignition will lead to unburnt fuel, wasting of usable fuel, washing of the cylinders witch will elad to ore wear, more fuel dilution in the oil, might also be harder on the O2's and cats, the extended crank would be harder on the starter and battery,

I think the preoiler would be a better route,

Good point. A drawback for sure but as cruiserdan mentions, I don't think it would require that much cranking but since it would be an unknown, I'd throw in a few extra cranks to make sure.

How would the service remote work in conjuction with the ignition? Would you have to hold the remote's button for extra cranks, turn the key to 'on' without going all the way to 'start'. Or would you have to stop the remote crank before turning the key all the way to start?

Which would be more cost effective, the pre-oiler or service remote? Ok, I've asked too many questions.

 

[cruiserdan]

My take is that one would engauge the "remote start" for a few seconds, release and then start the vehicle in the normal manner using the key in the ignition.

 

[miked]

I really like CDan's idea. Every time I change my oil, I pull the coil so I can spin the motor a few times to fill the empty filter. I like the idea of just spinning the motor without pumping fuel into the cylinders. I'm going to look into this further.

given my lack of motivation lately, I'm likely to just end up using a jumper to jack the solenoid so don't expect much from me..lol.

 

[Rusty Phillips]

edited

Would it be possible to put a delay/relay with a 5 (or 2, 7, 10, whatever) second lag inline with the EFI fuse? You turn the key and the crank starts turning and relay starts its countdown.... after 5 (?)seconds fuel comes on and engine fires up - it would be completely automatic - wife / teenage son / valet / brother in law proof. When you turn off the engine the power to the relay shuts off killing the engine like normal

While we are at it - why not also wire in a hidden on/off switch inline with the relay to stop fuel to injectors - (antitheft)

Plenty of places to put such a kill switch - just want to make sure that it wont get accidently pushed while your wife is trying to merge onto a busy interstate....

 

[Rusty Phillips]

also edited

another thought - instead of just a timer - use a oil pressure sender (off below Xpsi, on above Xpsi) wired to an on/off switch inline with the EFI fuse

found this https://forum.ih8mud.com/showthread.php?t=31568&highlight=efi+relay+delay

 

[Brian Macgyver]

Check your oil filter. The instinct is to use the optional large (PH8A) filter. It has more filter area and so is better, yes? NO! Running it will get you chain and rocker rattle on start-up. Use the small one to reduce noise. It gets pressure to vital parts faster. Toyo's run clean and won't plug up a small filter, that's why they use them. The small filter has been run 10,000 miles on synthetic without problems (I don't do that, or suggest it). I use the little filter with 10w40 for my climate to 3-4K miles and have no noises at all.