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Ranger starts-then-dies, then restarts fine. #5463423 06/26/20 02:50 PM
Joined: Feb 2013
Posts: 549
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brages Offline OP
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So I think I got my other problem fixed. I replaced the original fuel pump because of my truck's start-then-die behavior, but the replacement pump(s) were cheap and I think they didn't work well.

Here is the problem:

1997 Ford Ranger 2.3L engine, manual transmission

If you turn the key on to start the truck, after it has been sitting for more than a very short length of time, it will initially start, rev up a bit, then die. After that, if you try to restart, it will start right up and run fine.

If you turn the key to "ON" for a couple of seconds and wait, then start the truck, it starts and runs without dying.

Sounds like a fuel pump losing pressure, right?

Here are the things I've replaced that have had no effect on this behavior:
Fuel pump x 3
Fuel filter x 2
Fuel injectors
Fuel pressure regulator
IACV

With a pressure gauge on the fuel rail, no loss in fuel pressure is seen during the start-then-die event. In fact, the fuel pressure seems to increase as the engine dies (vacuum operated pressure regulator).

My guess is that there is maybe a tiny leak somewhere in the system and that causes the fuel pressure in the system to leak out -- and air to leak in (?). Then, the injectors get hit with a little bubble of air that makes the car die.

I guess the thing to do would be to get a UV dye for the fuel system and see if that will show any leaks.

Re: Ranger starts-then-dies, then restarts fine. [Re: brages] #5463496 06/26/20 04:12 PM
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skyactiv Online Content
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Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: Ranger starts-then-dies, then restarts fine. [Re: brages] #5463504 06/26/20 04:21 PM
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skyactiv Online Content
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Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: Ranger starts-then-dies, then restarts fine. [Re: brages] #5463633 06/26/20 07:35 PM
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ThirdeYe Offline
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I have something similar happen with my Camaro. When it sits for a while and when it's cooler out, it'll start fine then run really rough, misfire/backfire and sometimes stall. After about 30 seconds or so the revs will come up and it'll run fairly well. I've tried replacing the idle air control valve, no dice there. Tried running some fuel injector cleaner, nothing. EGR valve was also replaced but no change there. It has always used premium gas and has pretty low miles for the year. I had a similar problem with my old Firebird and it was the mass airflow sensor. I'll probably be looking at that next. Just thought I'd mention it as something you might want to take a look at as well. I've only driven the car a few hundred miles this year so far, so I haven't really been hunting down the check engine lights but mine is on with multiple codes as well. I believe two of them were for the O2 sensors. Weirdly, mine doesn't act up when it's warmer out (i.e. over 60 degrees).


07 Honda Accord - 627k - Pennzoil Ultra Platinum 5W-20/Wix 57356
98 Camaro Z28 (Bright Purple Metallic, 1 of 104) - 127k - Mobil 1 HM 5W-30/Fram Pro Synthetic XG3506
Re: Ranger starts-then-dies, then restarts fine. [Re: brages] #5463645 06/26/20 07:55 PM
Joined: Jun 2012
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oldhp Offline
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Fuel pump. Friends 2008 Ranger V-6 did same exact thing. Not every time, mostly after sitting, but not all the time.


"None of us are getting out here alive...drink that beer...eat that pizza...drive that Hot Rod"
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Re: Ranger starts-then-dies, then restarts fine. [Re: brages] #5463714 06/26/20 09:48 PM
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brages Offline OP
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Okay, I have figured out that THIS IS NOT A FUEL DELIVERY PROBLEM, as least as far as I can tell.

Scenario 1: with the engine running, shut the engine off. Leave key "off" for one minute. Attempt to start. Engine starts for one second, then dies. An immediate attempt to restart is successful.

Scenario 2: with the engine running, shut the engine off. Turn the key back on with the engine off. Wait one minute. Attempt to start. Engine starts and runs fine.

Note that in Scenario 2, the fuel pump is not running when key on engine off after the first two seconds.

Re: Ranger starts-then-dies, then restarts fine. [Re: brages] #5463761 06/26/20 11:57 PM
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Jimmy_Russells Offline
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Fuel pump relay

Re: Ranger starts-then-dies, then restarts fine. [Re: Jimmy_Russells] #5463871 06/27/20 06:43 AM
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brages Offline OP
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Originally Posted by Jimmy_Russells
Fuel pump relay


No

Re: Ranger starts-then-dies, then restarts fine. [Re: brages] #5464078 06/27/20 12:05 PM
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brages Offline OP
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Test: jammed the throttle partly open, still starts and dies.

Test: with MAF disconnected, it won't idle, runs very lean.

Re: Ranger starts-then-dies, then restarts fine. [Re: brages] #5464082 06/27/20 12:09 PM
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Popsy Offline
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Running lean with MAF disconnected? Could it be a vacuum leak somewhere?
Had it been a Barchetta, I would have pointed the TDC and camshafts sensors, but I don't know on that Ford.


96 Barchetta, 300V 5W40 | Forfour 95, M1 0W40
Mazda 6 2.3, M1 TDT 5W40 | Colt Ralliart, 300V 0W40
Re: Ranger starts-then-dies, then restarts fine. [Re: brages] #5464111 06/27/20 12:34 PM
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brages Offline OP
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Tell me more about the crank or cam sensors.

I saw someone recommend that for an Audi with a similar issue.

Thing is, other than the start-die, restart hassle the truck seems to run fine, no CEL. Idle isn't real smooth, but it's ok.

Re: Ranger starts-then-dies, then restarts fine. [Re: brages] #5464122 06/27/20 12:45 PM
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Popsy Offline
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I can only talk about the Hitachi injection system in the Barchetta, sorry. Such behavior in that particular car would be associated with a failing crank sensor, or camshaft sensor, or both, as the system is able to somewhat recuperate missing or corrupted data. Disconnecting the MAF sensor would bypass some sensors, but the camshaft sensor would still be needed. Anyway, different engine, so no real point there wink

Rough idle could also point to a vacuum leak somewhere, a pernicious one difficult to see. I don't know if you can look at fuel trims on that car?


96 Barchetta, 300V 5W40 | Forfour 95, M1 0W40
Mazda 6 2.3, M1 TDT 5W40 | Colt Ralliart, 300V 0W40
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