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  #13  
Old 01-19-2016, 10:10 AM
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Re: Starting issue doesn't start after 2nd start up (video)

Crank sensor didn't fix it.. I'm getting a diagnostic test done tomorrow on it. I'll let you know what comes back.

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  #14  
Old 01-20-2016, 12:27 PM
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Re: Starting issue doesn't start after 2nd start up (video)

I'm sure the diagnostic test will reveal more.

I once had an old 1987 Ford Taurus that would not start after it was running and warmed up. Once it cooled down, it would be fine again.

Turned out (after lots of troubleshooting) it was a cracked PCM board that expanded when hot, breaking contacts, and then when it cooled contracted back making the contacts again.

Problems like this can be hard to find!
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Old 01-21-2016, 10:17 AM
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Re: Starting issue doesn't start after 2nd start up (video)

So waiting for this dianosistic guy. He called and told me he couldn't come due to traffic, to far away blah blah blah. He told me to replace the Auto shut down relays. Buy them from the dealer only. If that doesn't fix it, could be the PCM. He said he's going to contact me next week. I looked up the ASD relays and a lot of problems almost similar to mine. But if that's the case why would it start after 20 min after cool down. If the relays were bad the car wouldn't start period? I could be wrong so please tell me. Thank you
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Old 02-04-2016, 09:20 AM
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Re: Starting issue doesn't start after 2nd start up (video)

Little update what's going on. Went to my fathers house. Waited about 15 min went outside (he knows about it but it hasn't happened to him yet) started it up didn't start. Tried again. Crank crank and crank. Nothing. Undid the air box that's attached to the throttle body. Sprayed Gum cutter in their. Turn the key started right up. Shut it off started up again. He said it's the fuel pump. It's not getting fuel into it he said. He said next time it does it spray it and see what happens..

So today went outside same thing. When the truck wasn't starting up. Sprayed gum cutter 2+2 started up no problems. No it doesn't shut off after I spray it. This time it kinda had a rough idle very light shake for a spilt second then went to a normal idle. I have a appointment at jeep today to get my Recall done and I told them to dianosistic. Which they won't know how or won't do it when it's in that mode. It takes usually 2-3 starts after the trucks been running a while. I told them but we'll See..

FYI. I had a typo in previously Post saying I replaced my cranksensor. I didn't. It's so rusted in there PB can't get it out. I told jeep to look at it. My mechanic hooked his scan thing to it and said it was giving a signal and was working , but he said it sometimes sends a faulty signal??? I'm thinking it's the fuel pump relays or the fuel pump it's self. I really don't hear the fuel pump prime. I would have to listen more closely today when I get my truck back.
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Old 02-04-2016, 03:35 PM
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Re: Starting issue doesn't start after 2nd start up (video)

It would be strange that it always starts up normally when cold, but won´t start after being hot, and it being a fuel pump problem. If it was running ok before shutting it down, there will be pressure in the fuel rail, which will take quite some time to bleed away.
The crank sensor is sometimes giving a faulty signal, so I would still try to get a new sensor in there.
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Old 02-05-2016, 12:36 PM
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Re: Starting issue doesn't start after 2nd start up (video)

Jeep is back from the dealership. They said they don't know and it didn't act up on them. They hooked a fuel pump gauge and had solid pressure at 55psi. I told them that you have to drive it shut it off drive it shut it off wait 15 min etc.. I really wasn't expecting them to becusse I'm sure there not allowed to just drive it around this and that. So it was a complete waste of $125. Lol so back to square one.(at least my recall is done) Next I'm going to order fuel pump relays and The auto shut down relays. Both relatively cheap. And continue to work on taking out the crank sensor. Nothing else I can do unless something else happens to someone let me know
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Old 02-09-2016, 11:49 AM
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Re: Starting issue doesn't start after 2nd start up (video)

Back in the carb days, I'd have issues with vapor lock on hot days.

While that shouldn't be an issue, what could be is a fuel mixture issue occurring because of a bad sensor that could be leaning out the vehicle.

In theory, this could be causing overly low pressure from the fuel pump when it's not a cold start that would require extra fuel being pumped through the system until it's warmed up.

Once warm, it goes back to lean and can't fire over.

I'd look at either a bad O2 or MAF sensor.
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Old 02-16-2016, 10:14 AM
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Re: Starting issue doesn't start after 2nd start up (video)

i replaced the ASD Relay and Fuel pump relay from the dealer. still acts up. could someone explain to me that how come when i spray gum cutter down the TB it starts after a few cranks of course. I've been reading a lot about the PCM and the ground wires that lead up to it. if thats the case wouldn't i have a CEL on. I'm going to my mechanic later in the week about the o2 sensors and MAF. And also about hooking up the fuel pressure gauge when its acting up. It has to be a Fuel delivery problem right? or a air/intake problem? fuel pump regulator going bad? I hear my fuel pump turns on. On another jeep fourm someone had the same problem and replaced the fuel pump and it fixed it.. I just can't toss $600 dollars to something i don't think will fix it.could it be my throttle body? i replaced the IAC already. I'm so annoyed with this problem and just want it fixed !!!
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Old 02-18-2016, 01:03 PM
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Re: Starting issue doesn't start after 2nd start up (video)

interesting
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  #22  
Old 02-18-2016, 10:10 PM
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Re: Starting issue doesn't start after 2nd start up (video)

O2 sensor input is not used during starting, so forget about that. MAP however is the #1 input for fuel injection pulse calculation, so at least i would check that out. You can see the MAP using a scanner with live data and compare the value with local barometric pressure. (ignition on, but engine off) I only wonder if this wouldn´t give starting problems when cold as well.
Check the IAT (inlet temperature) and ECT (engine coolant temperature) sensor values and see if they don´t show strange values.
If you prime the fuel pump three times when the engine is hot, makes that any difference?
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  #23  
Old 02-20-2016, 05:45 PM
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Re: Starting issue doesn't start after 2nd start up (video)

Priming it during the "no start doesn't doesn't work. Couple weeks ago while I was getting gas at the gas station. The RPMs shot up to like 3k and went back around 500 and it had a light shake, while it was fueling. And today got gas and I can see the RPMs dwindling 200 300ish to 600 what does that mean. During normal idle by rpms stay around 500 like normal. No rough idle on normal basis
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Old 02-21-2016, 07:55 AM
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Re: Starting issue doesn't start after 2nd start up (video)

Did you already check the TPS on a scanner with live data? Normal TPS % at idle is somewhere around the 12%. A bad TPS could explain the sudden rise in rpm or a sudden drop. If it would influence the starting however i´m not sure.
You indeed get not (enough) fuel during the hot start to let it start. Next time it doesn´t start, press the schräder valve on the fuel rail (on the right rail, it has a plastic cap on it) and check that fuel under pressure comes out. Use a rag to catch any spilled fuel to prevent fire. If you have fuel under pressure coming out, then the fuel pump is not the problem. Did you check the IAT and ECT sensors the moment it wouldn´t start? And what about the MAP during the no start condition? (just put ignition in run and compare the MAP with the local barometric pressure. )
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