engine wont start after warmed up normal driving

bong_ae86
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engine wont start after warmed up normal driving

Postby bong_ae86 » Tue Feb 14, 2017 2:53 pm

stock bluetop. starts cold no problem and strong, just after normal driving, motor wont start again until at least a good min or two. new spark plugs and fuel pump and still same problem. im pretty stumped on this.

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aukword1
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Re: engine wont start after warmed up normal driving

Postby aukword1 » Tue Feb 14, 2017 4:16 pm

what happens when you try cranking it after the engine is warm? Does the starter operate as it should?

bong_ae86
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Re: engine wont start after warmed up normal driving

Postby bong_ae86 » Tue Feb 14, 2017 4:54 pm

Yup, cranks strong and effortless.

bong_ae86
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Re: engine wont start after warmed up normal driving

Postby bong_ae86 » Tue Feb 14, 2017 5:02 pm

Normally I would follow the troubleshooting tree from the manual but it only talks about not starting at all. Something must be getting a bit to warm for immediate restart

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s24a
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Re: engine wont start after warmed up normal driving

Postby s24a » Tue Feb 14, 2017 5:14 pm

Might be vapor locking due to pressure regulator leaking (or maybe injectors).
Throw a pressure gauge on the rail and after you start it, watch the fuel pressure.
Then shut it off and watch the pressure decay.
A good regulator/injectors will hold pressure for over 30 minutes or so.
If yours starts to drop after a minute or two, then check first the regulator for leakage.

Then injectors.

Hope this helps.

Hank
"When the going gets, wierd, the Wierd turn Pro" -- Hunter S. Thompson

bong_ae86
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Re: engine wont start after warmed up normal driving

Postby bong_ae86 » Tue Feb 14, 2017 5:19 pm

Makes sense, when I did remove my fuel pump and disconnected lines, there wasn't must fuel coming out so maybe it's not holding pressure well. I'll check it out. Thanks!

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Jeonsah
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Re: engine wont start after warmed up normal driving

Postby Jeonsah » Wed Feb 15, 2017 11:35 am

When its warm and wont start, trying doing the basic checks:

1. Check for air (any blockage)
2. Check for fuel (return line/fuel pressure)
3. Check for spark

There a couple parts that could cause this issue (i.e. fuel pressure, injectors, coil/ignitor). Once you do the basic check, we will know for sure where to narrow the problem down to.
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AE86Kai
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Re: engine wont start after warmed up normal driving

Postby AE86Kai » Sun Feb 19, 2017 1:06 am

I had very similar issue on my old Levin.
Starts fine at cold but, after driving for a while, (may be 20-30min) stopping at gas station, my car did not start.
In my case, I had to wait until my engine gets cold...

After some research, it seems like it was common issue for AE86...especially if your starter is 30 years old stock.
My solution was replacing to a rebuild / new starter & modified some wires. (Direct power line w/relay from battery to the starter.)

May be not same issue as yours but, just my little input....good luck. :P

bong_ae86
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Re: engine wont start after warmed up normal driving

Postby bong_ae86 » Sun Feb 19, 2017 2:01 pm

Update: ran fuel pump for a few mins by jumping terminals per diagnostic, left spark plugs out to see if I could smell any fuel, none whatsoever.

My starter cranks no problem and continues to crank numerous times.

I did however notice #3 spark plug noticeably wet and piston is wet of suspected oil leak. But even if it is a slight oil leak I should have burned. The spark plugs are new and double checked the gap today. Wires and distributer cap are only about 4K km old and still look good. No diagnostic codes. Will do further insp when I have time.

bong_ae86
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Re: engine wont start after warmed up normal driving

Postby bong_ae86 » Tue Feb 21, 2017 1:43 am

found my problem, distributer cap was nasty enough that #3 did have the worst resistance check of them but was still within the limit from the book. from looks i didn't think it was TOO bad and wasnt a big deal so was overlooked and was starting cold no problem. but now it restarts no problem. Thanks everyone for inputs and reminding me to go back and check the basic stuff more carefully.

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Re: engine wont start after warmed up normal driving

Postby allencr » Thu Mar 02, 2017 7:01 pm

That dist. cap looks pretty normal/unremarkable & shouldn't have caused any warm start problems.
If you don't like the ascetics or the slight resistance increase, just scrape it off with your favorite knife or screwdriver or scissors & it'll be fine cause 40,000+ volts doesn't disappear that easily.
Did it or did it not spark when not starting and have or not have any residual fuel line pressure in less then minute?
Hold the throttle down/open 1/4-1/2 way when starting warm worked for me.

bong_ae86
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Re: engine wont start after warmed up normal driving

Postby bong_ae86 » Sun Mar 05, 2017 6:22 pm

allencr wrote:That dist. cap looks pretty normal/unremarkable & shouldn't have caused any warm start problems.
If you don't like the ascetics or the slight resistance increase, just scrape it off with your favorite knife or screwdriver or scissors & it'll be fine cause 40,000+ volts doesn't disappear that easily.
Did it or did it not spark when not starting and have or not have any residual fuel line pressure in less then minute?
Hold the throttle down/open 1/4-1/2 way when starting warm worked for me.



the resistance for the rest were good except this one which was a little over 20. FSM states max is 25. not sure how much the heat can affected it but after i cleaned it up, but i can now restart it normally

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