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  #16  
Old 08-06-2011, 08:07 AM
Psychopete Psychopete is offline
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Join Date: Jun 2009
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Default Re: 87 Ranger 2.9 miss need help

31 can also be EGR related. I don't think there's anything that can sense an evap system issue, the system is real simple. Just a line form the tank to the charcoal canister, then from there to the bottom of the TB.

I don't think that model has a fuel pump monitor, so it doesn't watch the voltage going to the actual pump (would be a code 95 or 96). I would suspect it's basing that off the grounding function of the pcm to the fuel pump relay. So could be dropping 12v from the ecc relay or somethings happening with the ground. Could be anything from bad contacts on the relay/harness/bad relay. 87 is purely an electrical code and has nothing to with the pressure output, pressure is not monitored electrically. If your fuel pressure is right, then the pumps are fine.

Real strange that you cannot get KOER... If you're using a code reader, try to do it manually.
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  #17  
Old 08-06-2011, 02:01 PM
Ack Ack is offline
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Default Re: 87 Ranger 2.9 miss need help

I just got a egr today will probably have it on tomorrow. Ill run the test again and see what happens if the same thing I will do it manually. Thanks for all the help.
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  #18  
Old 08-06-2011, 07:35 PM
Psychopete Psychopete is offline
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Default Re: 87 Ranger 2.9 miss need help

A lot of the time the problem will be in the vacuum lines, but hard to say what it is for sure. There's a way to test the egr system - check out this article

http://www.fordfuelinjection.com/?p=43

Pretty common to find the intake completely clogged right past the egr valve also.
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  #19  
Old 08-07-2011, 02:04 PM
Ack Ack is offline
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Default Re: 87 Ranger 2.9 miss need help

Changed the egr runs alot better the rod was stuck and seemed to be bent because i couldnt pull it back down. Ran the codes again koeo 31 87 and I dont remember the other one but it was vacuum leak bad ground something like that. Koeo test just got code 87 again wich I changed the relay and I just got a new tank and fuel pump casus the tank leaks and my gas gauge dont work will have it in monday. Got 87 again and the vacuum code. So I really dont know where to start looking for leaks kinda lost on that. There was no blockage behind the egr it looked pretty clean. I also got the code for the dis cap.
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  #20  
Old 08-09-2011, 06:50 AM
Earlyboomer Earlyboomer is offline
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Default Re: 87 Ranger 2.9 miss need help

Psychopete gave you some good places to start. Too many posters don't bother to tell the mileage on their vehicles. At 170K+ miles with my 2.9L Ranger, I installed two pumps, two fuel filters, an ignition module, and rebuilt injectors before I got rid of starting and irregular idling problems. I had already upgraded the distributor cap, plugs, wires and a couple of sensors. Injectors were one of the main problems and tricky to install.
This engine has always run on synthetic oil and runs pretty well now, but I doubt that an engine with that many miles will still have the power it had when new. It has 3.73 rear gears and a 5 speed and the pick-up is alright but as I said before, the new 4 cylinder Japanese cars can beat it. It still doesn't burn oil, but the valve covers always want to leak oil. On the highway it will still collect a lot of tickets if you don't watch out. I need to run a compression test, it idles smooth enough, but it still doesn't run quite a smooth as it did. This is to point out that with 25 years and 170k miles, you do need to be thorough about maintenance. I have seen people in Texas driving cars that were running with a couple of dead cylinders, but that is not us.
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  #21  
Old 08-10-2011, 02:09 PM
Ack Ack is offline
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Default Re: 87 Ranger 2.9 miss need help

So I changed the tank and fuel pump it runs great for about 10 mins or so then the miss comes back. What do you think about clogged cats caus it blows a lot of of black smoke when you gas it. But fuel pressure is fine right bout 40 paid.
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