Question about 1987 Ford Ranger

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I have changed the 2 fuel pumps, filter, temp. switch, map sensor, plugs, wires, fuel pressure switch and the list goes on but when I put it in gear and start letting out on the cluch it looses fuel pressure and cuts off

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This is something I have not heard of before. I suspect it can have something to do with the Interlock switch on the Clutch pedal. Does the engine also cut out putting it into Neutral?
Check under your dash for switches on the pedal levers. Many times people get no-starts when a switch is dislocated by a shoe. Yours could be starting and then losing the Ground when the clutch pedal moves.

The Relays in the Powerbox for your fuelpump and Ignition may also be a good place to check too. Some of the Relay terminals are Ground terminals and once the truck is running the Interlock switch is not suppose to matter. The PCM is suppose to control the Relays and if a Ground is corroded the truck is searching for a Ground somewhere.

When I read your request I was wondering if the fuelpump is shutting off early causing your truck to cut out. The defect is loss of a Ground or power to the fuelpump.

Posted on Mar 15, 2011


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I have a 1990 jeep wrangler 4 banger 2.5l manual tranny She runs and starts fine but I can only drive about 1 mile before it starts losing power. It gets to the point where I'll be in first gear trying to...

do a 60k tune up first, all below assumes you did, spark parts, filters. dah?
first off the engine EFI runs a map sensor, (called speed density system)
so that means if the engine can pump air (compression tests PASS)

the MAP see that, air flow (calcs) and matches air with proper fuel.
1990 is a vary bad year, it has the horrid, Renix french pos EFI system. (owned 2, can taLK days on this ecu FROM H3LL)

but there is no CEL lamp, nor any scan tool , that will work here.
(unless you can find a working DRB tool, ) NO FLASH CODES !!!
above poster never seen RENIX, so.. .answers wrong. ITS OK.
1993 this changed (Chrysler) and started OBD1 ECU which we can scan easy. (innova 3140)

all this means is you must be smarter than the average bear.
are you>? got tools, meters. and all that? you will need it.
and a FSM book or login to like we do.

if compression test pass, and vacuum at 19" idle and gunned throttle drops low fast and if you release throttle it goes why high fast 25inches>? and goes to 19inchs again, the engine is ok and cat not melted, all that in 5min work (vacuum tests) and vacuum not bouncing? 1 glance, no its steady vavcuum.
so I wave my magic wand, go, gee engine is ok.
i then check fuel pressure use a REAL gage.
it idle and throttle gunned. for spec pressures.

if all that pans out> whats next? well EFI is next,.
i check the MAP sensor voltage at 3 points.
key on, idle and gunned. for spec, readings. if not map is bad. or just clogged.
check all the other sensor by hand is next. and ill not attempt do post what ever mech ,knows here, "basics"
a volt meter , you can check them, ECT, IAT, etc.

my wild guess low fuel pressure. (BASE ON OK 1 MILE)
or FPR stuck wide open' (bad fuel pump reg)
or a bad wire to fuel pump, such that pump does not receive full 12vdc power.

here is map readings, ill post this because many books fail to show it.

if input to map is good, but output wrong, the map is DOA.

Mar 09, 2015 | 1990 Jeep Wrangler

1 Answer

2004 jeep wrangler 2.4 motor bucks on hills.

W.O.T. MISFIRE< that is what you have.!
is the CEL lamp glowing running , and for sure WOT?
yes, then scan it, get the codes, P0300? P030x? what is it?
hell, id scan it and look for pendings,!!! and freeze frame fails.
i would, id not leave that stone unturned, not me....ever.
it is the first after a tuneup full, i look for troubles even marginal.

Ever to a full 60,000 mile tune up? (fuel filter?) not just plugs?
spark wires, see the list. , ,wires and plugs and filters.. skip this service, means long hard and difficult troubleshooting.

2.4L I4,
if fuel pressure is good on hills its not the pressure side. 49psi.
but the car has a fuel pressure regulator, and we test that at the pump test, its part of pump, if not skipped. with gauge, we make dang sure it regulates.
new fuel pump , means zero to me
49 psi pressure now that matters, what if the reg is bad or the
12v power to pump is 6v, bad.
and not doing the leak down test at the pump pressure
test , misses the injectors leaking, or the balance test shows
clogged injector on say #1 . (not equal)

Real tune up done, and no DTC errors store, or pending.

only hills, can be
clogged injectors
MAP reading wrong, (clogged vacuum input to it)
when you WOT the throttle (wideopenthrottle) the MAP pin1 voltage
changes to 1Bar, (atmospheric, or 0 vacuum)
see page 31 in fuel system section of FSM.
the page is weak, no graph, but 0v (near) is very high vacuum and
4.6V at WOT, sea-level reading)
using absolute pressure method not vacuum (which i like)
is 0v is zero pressure (huge vacuum)
is 4.6v at full atmospheric pressure wot, the butterfly TV is wide open.
at keyon, no start the map is at atmospheric, pressure, 14.7PSI
or 1 bar, pressure. (about)
so if you monitor the mAP voltage output and it goes new 0v at WOT
then its done its job. an the misfire is caused by other reasons.
just one voltage test, and bam. not MAP or clog there.
i check map key on, idle and wot. 3 readings. to prove good maps.
in most cases the clean map works every time. see that its nipple
end is clean, (vac, port)

the ecu reads the MAP and the IAT temp, and computes AIR FLOW
and MATCHES that. with 12.5:1 Air top fuel ratio.
(fuel injections works just like this on Speed Density Systems)

and makes full power. if spark is good, and compression is good.

if the injectors are clooged, it misfires, if the spark plugs foul, missire
if the injectors leak, again, misfire.
that is how it all works, cept the magic fuel; tables in the ECU.

the scan tool ECT showing, 180F or more holding hot engine?
no , then thermostat is bad and AFR is rich as heck.
Is IAT reading odd? not equal to ECT first check key on , in morning not started, is bad IAT. they become equal as you sleep. overnight
the air temp matches the water.... a very easy trick this test.
by careful observation, key on, no start.
the 2 sensors report in , even key on,. all the time.
using any scan tool (not old)

Feb 03, 2014 | 2004 Jeep Wrangler

3 Answers

Have a 2000 buick century was running great parked it for the night went to start it the next morning it would not start, put in new fuel pump, fuel relay switch, n fuel filter. still will not start.

Depress the gas pedal halfway while cranking. If it starts, that's the symptom of a bad engine coolant temp sensor. Makes computer think engine is warmer than it is and PCM gives too rich or lean a mixture making it not fire up

Dec 05, 2017 | 2000 Buick Century

1 Answer

2001 nissan sentra 1.8L 4cyl. running codes P0105:P1605:P0171:P0325... engine idles fine when in park just not in gear, in gear it shakes pretty bad, also hesitates to accelerate when you press on gas...

code po105 refers to manifold absolute pressure(MAP)sensor/barometric pressure (BHARO) sensor -circuit malfunction==causes--wiring MAP sensor--BARO sensor--ECM
code p0171 refers to system to lean bank 1===causes intake/exhaust leak---AIR system MAF/MAP sensor fuel pressure /pump /injectors--HO2SW
code p0325 refers to knock sensor(KS) 1 bank 1-circuit malfunction====causes--wiring ---poor connections---KS
Check the exhaust flexible pipe at the manifold for cracks
have a fuel pressure test done on the fuel manifold to determine either pump/ filter or pressure regulator.
replace HO2S unit

Sep 21, 2013 | Cars & Trucks

1 Answer

1993 Chevrolet Lumina APV hesitates and dies when in gear

When it stops running and will not start back up, you'll need to figure out if you are lacking spark or fuel pressure to proceed with testing.

May 12, 2013 | 1993 Chevrolet Lumina APV

1 Answer

1996 sunfire wont idle noiw wont start fuel pump n filter replaced maybe its the pressure regulator it has lots of spark any ideas?

maybe the fuel pump relay, inertia switch, ,MAF sensor, MAP sensor,...the list goes on. just check one at a time untill you find it!

Dec 06, 2010 | 1996 Pontiac Sunfire

1 Answer

1991 302 runs like it is chocking out, I have changed the fuel filter, plugs wires rotor cap, and map censor, runs rough and worse when in gear, eating please? The truck is a 1991 f150 NITE 4x4

is it idling high and you put it i gear it runs rougher and smoke black check your coolant sensor also connection or sensor itself and fuel pressure if high check for return line blockage also vacuum leaks make sure you have the right vacuum going to your map sensor you need to check right vaccum at idle going to your map sensor/

Jan 19, 2010 | 1991 Ford F150

1 Answer

1988 f-250 w? a 351 windsor is it the map sensor?

HI. there are several problem areas that will need to be inspected. follow the list below to address this issue further.


1. Fuel Filter. If the filter has not been change recently, this will be the culprit. Clogs in the filter will cause surging. replace if needed

2. Intake Manifold Gasket. Check this gasket for leaks, or worn edges. replace if damage is visible.

3. Fresh Air Intake Hose. This hose may be clogged, or damaged. inspect for these faults. replace if needed.

4. Fuel Pump. A weak, or poorly grounded pump will cause low fuel pressure, in return, causing the surge effect. inspect the fuel pump for these faults. replace if needed.

5. Fuel Injectors. A dirty, or faulty injector will cause the surge as well. inspect the injectors for faults. replace any injector that is faulty.

6. Oxygen sensor(s). A faulty O2 sensor will promote surging as well. This will usually be accompanied by an illuminated check engine light. If this is the case. the O2 sensors should be changed.

7. Carburetor. A Dirty and Improperly Functioning Carburetor will cause the surge effect, also. Check to make sure the carb is functioning correctly(IF EQUIPPED)

8. Map Sensor . A defective manifold absolute pressure sensor may cause a rich or lean air/fuel ratio, excessive fuel consumption, and engine surging. this diagnosis applies to map sensors that produce an analog voltage signal. To check the sensor, back-probe the 5-volt reference wire(with the ignition on), and connect a voltmeter from the reference wire to ground. If the reference wire is not supplying the specified voltage, check the voltage on this wire at the computer. If the voltage is within specifications at the computer, but low at the sensor, repair the reference wire. When this voltage is low at the computer, check the voltage supply wires and ground wires on the computer. If these wires are satisfactory, replace the computer.

With the ignition switch on, connect the voltmeter from the sensor ground wire to the battery ground. If the voltage drop across this circuit exceeds specifications, repair the ground wire from the sensor to the computer.

This concludes the surge inspection chart. you will find the issue in one, or more of the areas stated above.

Nov 10, 2009 | 1988 Ford F 250

2 Answers

1988 Buick LaSabre-Starts, but when you put in gear, it dies.

I would start with the MAP sensor.
You can also pull codes out of it. there should be a 10 or 12 pin plug under your dash in the canter of the car. here is a link that may help.
- North Central Regional Library
Good luck

Aug 18, 2009 | 1988 Buick Regal

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