WackyRotary

Problem: Car won't start warm at all easyily. IT runs perfect when its finely started!
Even if you turn it off for just 5seconds and turn the key to start it again, it takes foooooor-ever!

When the car is cold, it starts on the first try!

I don't have this figured out. Here is the setup: Mikuni intake system, headers, brand new spark plugs that are not fowled, I tried a old set of plugs that resulted in the same thing>cold start fine, warm not easyly. No vaccum leaks, correct timing is set. Plug wires are almost new.
Compression is good, the engine has a mild-extend-port set-up and has started fine in the past summer when warm like this. Idle and transition to open throttle is fine.

The reason I'm really concerned is that it had trouble starting a different engine I had in it before with the same set of syiptoms as now.


My thought is that the Leading coil is getting a weak spark maybe, but why does it start easyily when its cold? How would one know for sure whats going on with it?

WackyRotary

Any clues?..............

SlithyTove

I'm a rotary newbie myself but I've been told that if you stop a rotary and try to restart it and it doesn't restart easily that it is a sign of low engine compression.

mar3

iTrader: (8)

To me, it sounds like you're starter is getting either heat-soaked or on its last legs. Whenit's cold the resistance seen at the starter is very low so it doesn't drain the battery to spin the engine. When the engine and thus also, the starter get hot, the resistance at the starter in a tired unit gets sky high and even a good battery will have a time of spinning the engine fast. Check out the "starter trick" thread for a cheap way to get more juice down there.

WackyRotary

WEll I know the starter wasn't the problem now. Afterall it was turning very well, and its relatively new, the battery is old though, but, I got the starter 2 years ago after the old starter solinoid engager piece wouldn't respond to anything I did to fix it. But I did swap the leading and trailing coils and that made it start instantly. So either the leading coil was bad or just connections in the coil wires were bad, or the ignitor wires going to the coils were making a bad connection.

I took and sand papered everything and then put dy-electric grease on all connections, and now it starts almost instantly! PHwwwww!

DONNA

on the passenger side below carb, there is a round part with a solid black and red wire comming from it, what might this part be and what does it do,,,i have a spare one and the pointed thing inside doesn,t move and the one on the car comes all the way out,,whice one is a good part ,,,,thanks,,,,you guys are a wealth of knowledge and are always willing to help out........

mar3

iTrader: (8)

Amazing the things we take for granted. I'm going to do the same thing this weekend and see what it does for my beast. I know it's been at least 3 years since I touched the coil to ignitor systems. Thanks for the idea...

FuLLsMoKe

Ok, this should be a simple problem...

On the driver side of the engine, you'll see a thing attached near the strut that has a motor on it and a cable coming out of it... That is your hot-start assist motor--check this motor because when the engine is warm, it will blip the throttle and allow a easy warm start...

My $3 billion...

REVHED

I'm sure WackyRotary as well as most other people here know what the hot start assist is and most people here have probably gotten rid of it as it's just one more useless thing to clutter up the engine bay. How hard is it to blip the throttle with your foot when cranking anyway?

mar3

iTrader: (8)

Why keep the extra weight and nonsensical cable mess? It was put there by the factory because they didn't want their customers to be so inconvinienced as to have to tap the throttle themselves. It's definitely not necessary...it's one of the first things I pull off any rex I buy.

FuLLsMoKe

okokokok, i wasn't thinking... i guess...

*sigh* please accept my humble appologies

WackyRotary

OF course everyone that has a stock carb I am aware of that system, yes. I don't have any real issues with any unnessary cables to speak of since The mikuni carb setup only has the throttle and choke. This carb doesn't really require much bippling the throttle normally either to start it. This problem is/was weird, it is still doing it from my post that I fixed it.

But it does it eradicately. Starts warm right away sometimes, others takes a lot of pumping the gas and turning the starter to get her going. Compression is good, I just assembled the engine and everything is with-in acceptible limits springs and such things. I am convenced its some wire in the igition system before the plug wires that is to blame.