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88 2.9 Ford Ranger hard starting when hot and idle stumbles


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backstreets
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May 27, 2011, 4:19 PM

Post #1 of 14 (3110 views)
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88 2.9 Ford Ranger hard starting when hot and idle stumbles Sign In

Got a 88 Ford Ranger 2.9 F.I. with 156K miles. New plugs, wires, cap/rotor, fuel/oil/air filters, new thermostat, no check engine light, don't burn oil and blew the doors off emissions test.

Starts ok when cold and restarts really nice if not sitting for more than 10 minutes or so, but if it sits a little while it is hard to start. Cruises and accelerates real nice, but when at Idle it will die (stumble) a little every 10 seconds or so and "rarely" it will almost die.

Any ideas

Thanks,

backstreets




Hammer Time
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May 27, 2011, 4:46 PM

Post #2 of 14 (3102 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.



Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.


2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.


3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.


Once you have determined which of these functions has dropped out,
you will know which system is having the problem.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



backstreets
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Oct 13, 2011, 2:42 PM

Post #3 of 14 (2765 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In

This was not a "crank no start problem" so I didn't go through that procedure.

I took off the "throttle position sensor" and checked it out and it seemed ok and then I put it back. After that the truck stopped surging (dieing a little). It seems when I put it back on and worked the spring loaded parts getting it on that made it operate normally again. One of the minor bugs fixed.

It is still a bit hard starting after it sets awhile after it is warmed up otherwise it starts up just fine. The other minor bug that still needs fixing. Now to figure out why.

backstreets


Link from other forum removed



(This post was edited by Hammer Time on Oct 13, 2011, 3:49 PM)


Hammer Time
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Oct 13, 2011, 3:49 PM

Post #4 of 14 (2756 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In

So you have a "no crank" problem then?




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Old 396
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Oct 13, 2011, 4:49 PM

Post #5 of 14 (2747 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In

Starts ok when cold and restarts really nice if not sitting for more than 10 minutes or so, but if it sits a little while it is hard to start.

Any ideas

Yes. Here are a few ideas for you to rule out or in. Be sure to post the results.

Fuel pressure regulator issue
Fuel leak down issue
Failed check valve at the fuel pump
Clogged or collapsed sock screen at fuel pump.



re-tired
Veteran / Moderator
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Oct 13, 2011, 8:54 PM

Post #6 of 14 (2732 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In

That answer is a re-write of HAMMER TIMEs post .


LIFE'S SHORT GO FISH


Hammer Time
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Oct 13, 2011, 9:14 PM

Post #7 of 14 (2729 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In

He's assuming that he knows it's a fuel problem. Guess he has a crystal ball.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Blulakr
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Oct 13, 2011, 11:32 PM

Post #8 of 14 (2724 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In

Will it start if you hold the throttle open a little??

Clean the throttle body with a rag\brush and carb cleaner. Start it and rev it a few times to clear it out. Disconnect the IAC, set the base idle to 600 rpm. Reconnect IAC, disconnect battery for 30 minutes. Reconnect battery, start engine and let idle for 10 minutes.

Let us know.


Hammer Time
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Oct 14, 2011, 6:10 AM

Post #9 of 14 (2722 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In

No, I don't advise trying to adjust the base idle. Unless you have already disturbed something, that adjustment should not be touched and especially by someone not experienced in doing that. I seriously doubt the IAC has anything to do with a hot start problem.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



backstreets
Novice

Oct 14, 2011, 10:26 AM

Post #10 of 14 (2712 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In


In Reply To
So you have a "no crank" problem then?


I said it is "hard to start". Never said it would not crank.


backstreets
Novice

Oct 14, 2011, 10:38 AM

Post #11 of 14 (2711 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In


In Reply To
Starts ok when cold and restarts really nice if not sitting for more than 10 minutes or so, but if it sits a little while it is hard to start.

Any ideas

Yes. Here are a few ideas for you to rule out or in. Be sure to post the results.

Fuel pressure regulator issue
Fuel leak down issue
Failed check valve at the fuel pump
Clogged or collapsed sock screen at fuel pump.


I do smell gas sometimes when I start it up, but I have been unable to find a leak. Leak-down problem seems most likely.

Thanks for the ideas


backstreets
Novice

Oct 14, 2011, 10:49 AM

Post #12 of 14 (2713 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In


In Reply To
Will it start if you hold the throttle open a little??

Clean the throttle body with a rag\brush and carb cleaner. Start it and rev it a few times to clear it out. Disconnect the IAC, set the base idle to 600 rpm. Reconnect IAC, disconnect battery for 30 minutes. Reconnect battery, start engine and let idle for 10 minutes.

Let us know.


Hard to start means it starts. When it is warm and has set awhile it will start, almost right away, if I give it a little throttle. If I don't give it any throttle it has to crank awhile before it starts.

I have cleaned the throttle body with throttle body cleaner after I had this problem and it didn't help, but it is always a good idea to keep the throttle body cleaned out anyway.

The idle is idling at the correct speed (800 rpm) and the sticker says idle is not adjustable, so I am not going to mess with it.

Thanks


(This post was edited by backstreets on Oct 14, 2011, 11:21 AM)


backstreets
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Oct 14, 2011, 11:17 AM

Post #13 of 14 (2709 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In


In Reply To
No, I don't advise trying to adjust the base idle. Unless you have already disturbed something, that adjustment should not be touched and especially by someone not experienced in doing that. I seriously doubt the IAC has anything to do with a hot start problem.


I think that is good advise not to adjust it. The sticker on the truck says idle is not adjustable. So I an not going to mess with the idle. It is idling at 800 rpm and that is what the sticker says it should be idling at.

Thanks


(This post was edited by backstreets on Oct 14, 2011, 11:27 AM)


Hammer Time
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Oct 14, 2011, 3:59 PM

Post #14 of 14 (2697 views)
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Re: 88 2.9 Ford Ranger hard starting when hot and idle stumbles [In reply to] Sign In

Hard to start is not a technical symptom. Why is it hard to start? Is it because the starter is not cranking it over fast enough or is is cranking fine and just won't start?




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.





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