Question about 1986 Ford Ranger 2WD

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I have a 86 Ranger 4x4 2.9 5 speed.When the rpm get to about 2500 rpm it start to cut out.I have replace all the sensor, pump in the tank,dist,fuel reg,plugs,wires,coil air valve (all new parts).I have check pressure on both side of the cats (2.5lbs).Fuel pressure is 40lbs key on 30lbs when running.vac is 15lbs strong my elv.is 4200 ft.I have check volts at the dis.and sensors and they check good.It runs good up 55 mph gas milage is at 20 mpg.where do I go next? Could there be a voltage feedback? Is there some way I can check eec-IV?I have been fighting with it for about 18 months I have had it in the ford shop 2 times (no help). wits end Rich.

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Check the hall effect switch in the distributor

Posted on May 12, 2010

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Posted on Jan 02, 2017

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My 03 Nissan Altima wont get over 2500 rpms


first check your fuel system, replace fuel filter, also check your fuel pressure regulator on your fuel rail it may be leaking internally if ok check your fuel pump operation. if your fuel system is ok then check for a restricted catalytic converter its a common fault I encounter with them. if that to checks out ok then have the ecm scanned by a shop or the dealer could be a faulty engine speed sensor or crank or cam sensor

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22004 ford ranger not getting fuel, replaced fuel pump 2 times in 16 months plus carb overhaul, what to check next?


Sometimes there is a plastic strainer in the gas tank and when they break down they will clog the fuel pick up. After the suction stops the pieces settle until the next time.

Ever replace the fuel filter or check for fuel getting through the filter?

Besides the inertia sensor which needs to be manually reset, some of these motors had an inline fuel pressure regulator. Another area can be a crankshaft sensor which adjusts fuel pressure to RPM.

Believe the inline pressure regulator works off vacuum so the "check engine light" would not diagnose. On the other hand, the crankshaft sensor should generate a trouble code. Curious as to what you find.

Jul 20, 2017 | 1984 Ford Ranger

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Why does my 86 2.9 l. ranger kill spark plugs


your truck is running too rich with fuel if you have a carburator have it check

Sep 18, 2012 | Cars & Trucks

1 Answer

How do i know if my fuel pump is bad on my 86 ford ranger?


You can hear it running for about 1 second when the key is switch to "ON", it is a very low pitched "Humming" noise. The pump is inside the fuel tank and it is best heard by removing the gas cap and putting an ear close to the filler hole. The symptoms you have are most likely not a fuel pump. Rangers in this year are prone to problems in the engines wring harness. This is a very DIFFICULT problem to track down, and i say this from 20 years of working in a Ford dealer as a tech, this type of problem was my everyday bread and butter..

May 01, 2012 | 1986 Ford Ranger 2WD

1 Answer

I have a 2000 s-10 blazer 2wd vortec 6 it has been a great truck .Lately it has balked on the road,when in out of gear it will not rev over 2500 rpm,when driving its slow to pick up ,sometimes...


Check fuel pressure wit a guage at schrader valve on fuel rail with key on and engine not running. The pressure needs to be 55 to 61 PSI. If it is less than 55 PSI, replace the fuel pump in gas tank and fuel filter. If it is more than 61 PSI, replace fuel pressure regulator.

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Check EGR valve this controls idle speed it might have carbon build up hold the valve open. All so check fuel pressure.

Jun 26, 2009 | 1988 Ford Ranger

1 Answer

Engine boggs down


either fuel filter or fuel pump...replace filter since its cheaper. 6-12 dollars at autozone

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1 Answer

2004 lly duramax


try hooking up a fuel pressure test gauge to fuel rail pre filter and post filter and rev truck to 2500 rpm what is fuel pressure ?
next using a vacume pump attach to fuel pressure regulator pump up while engine is running only pump up to 8 psi to see if pressure changes if not replace pressure regulator .
it could also be ur speed sensor switch on overdrive transmission
good luck with it

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