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-   -   87 4.2L sometimes hard to start (http://www.jeepforum.com/forum/f12/87-4-2l-sometimes-hard-start-1555537/)

ufvj217 07-30-2013 05:05 AM

87 4.2L sometimes hard to start
 
So my 88 YJ I bought about 2 months ago is great except for every once and a while it's hard to start. Usually after I drive it to one place, park go inside do whatever then come back out, it takes a few cranks of the key to start. And when it finally starts sometimes it'll blow a little white smoke out of the exhaust. Other than that it doesn't smoke overheat etc. The guy I bought it from said sometimes the choke sticks??

Its all stock as far as I know except a motorcraft carb.

Old4X 07-30-2013 05:36 AM

Normal for a carb sitting on the exhaust manifold in hot weather.

ufvj217 07-30-2013 05:40 AM

Should I pump the gas at all? Not sure if all carbs are like that but my dads 81 vette I pump the gas when starting after sitting. Once its started it'll start right up after that even when its warm.

Rproject 07-30-2013 05:52 AM

As a practice, I put the pedal to the floor ONE time, then back up, to set the choke, before I start mine. Every time. Creates a habit and seems to help her kick over cleanly. Even when warm.

I'm also running the MC2150.

ufvj217 07-30-2013 05:54 AM

Ill try that out. Could it be possible that the choke sticks like the PO told me?

And the smoke is normal?

Rproject 07-30-2013 06:06 AM

Quote:

Originally Posted by ufvj217 (Post 15734420)
Ill try that out. Could it be possible that the choke sticks like the PO told me?

And the smoke is normal?

White smoke is typically the indicator of anti-freeze in the exhaust system. Either that or your Jeep just elected a new Pope. :rofl:

As for the one pump chump start. By setting the choke before you start it, you could be avoiding a stuck choke issue. It's worth a shot.

ufvj217 07-30-2013 06:16 AM

Hmm..hopefully no antifreeze in the exhaust. ..

jokerchief462 07-30-2013 07:23 AM

Depending on outside temp almost all vehicles produce a little white smoke after start up and you can see some water dripping from the exhaust tip. It's condensation from hearing the air and it goes away fairly quick unless it is really cold out.

Are you sure that's not what your seeing???

ufvj217 07-30-2013 07:42 AM

Ill take a video next time I drive it which will probably be later this evening.

jimhill 07-30-2013 08:13 AM

Quote:

Originally Posted by Rproject

White smoke is typically the indicator of anti-freeze in the exhaust system. Either that or your Jeep just elected a new Pope. :rofl:

As for the one pump chump start. By setting the choke before you start it, you could be avoiding a stuck choke issue. It's worth a shot.

That was a good one lol

bpounds 07-30-2013 08:42 AM

When the engine is cold, I push the throttle halfway and release once, and she starts better than at any other time.

When the engine is warm, I hit the starter and then progressively give more throttle as it cranks, and it usually kicks over. If it cranks a little more than expected, I'll give the throttle a couple of pumps to get some fuel moving. I've not yet seen this engine/carb flood. If it isn't starting, it needs some pumps. I'm running a fresh rebuild of the OEM Carter BBD.

You just have to find the combination that works for your setup. Those of us who were around before fuel injection took this stuff in stride. No more just reaching through the window and turning the key. You're going to be a little more interactive with it and you have to learn her preferences.

jbrown73 07-30-2013 08:48 AM

I had the same issue with mine (Weber 32/36) with hard starting after shutting down and letting her sit for a little bit. I tried all kinds of starting scenarios and found that if she had been off for 8+ hours, then I would set the choke by one full pedal press. Once warmed up/driven and shut back down for any shorter duration, I do not touch the gas pedal and she cranks up after 5-10 seconds. Every time I tried to manipulate the gas pedal while trying to crank when the engine is warmed up resulted in flooding.

Old4x has an excellent point with his comment and that condition contributed to some of my issues. Vapor lock is causing your hard starting due to the nature of the carb sitting directly above the exhaust manifold. With the engine at operating temp and then shut down, everything is becoming heat soaked and the fuel is actually boiling in the carb. Next time you shut her down after driving a while, wait about 5 minutes and lift the hood......I'll bet you will hear the fuel boiling in the carb bowl. I actually started a thread on this a few weeks back. Search 'fuel boiling in carb'.

bpounds 07-30-2013 09:50 AM

Quote:

Originally Posted by jbrown73 (Post 15734901)
...I do not touch the gas pedal and she cranks up after 5-10 seconds...

That's a loooong crank in my book.

Rproject 07-30-2013 09:53 AM

^ Beat me to it

jbrown73 07-30-2013 10:10 AM

It was an estimate.....more like 5 seconds. I was in a hurry to type since I'm at work.


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