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  #16  
Old 08-15-2018, 07:38 PM
450thumper 450thumper is offline
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Default Re: What could cause this misfire

Thanks for replies guys, i got some work to do now. I really dont want to stsrt throwing parts at it. Replacing coils and o2 sensors. But if thats what its takes then ok.

I know the tube going to the emmisions box below the battery i had plugged.

Thats good to know the truck has two engine temp sensors the one i had pulled out for the accessorie gauge made the gauge in my cluster drop. So the other sensor must run the computer. I never had an issue when i first did that either. Where is that other sensor located ? Maybe it needs replaced

AIT in the mass air flow ?
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  #17  
Old 08-16-2018, 06:17 AM
RoberticusMaximus RoberticusMaximus is offline
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Default Re: What could cause this misfire

seems like the IAT is by itself in the intake tube closer to the throttle body...

...heres a post saying its between the filter and throttle body: where is the iat sensor location on 97 ford ranger?
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  #18  
Old 08-17-2018, 03:30 PM
450thumper 450thumper is offline
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Default Re: What could cause this misfire

Alright guys, i replaced the the solenoid and hoses going to the catch canister for emissions the one i had deleted and plugged prior because it was bad. Its that box below the battery.

I sprayed starting fluid around intake and vac lines while running and it had no affect. So i dont believe i have a leak.

I replaced the IAT with another used one to see if that would make any changes. Also pulled battery reset everything.

No changes, still have same issues.

Its idling rough and if i hold it at like 1,200 rpms it misses out bad. But if im higher in the rpms its smooth and strong.

I still have the code for o2 sensor. Could a o2 sensor really make it idle rough and run like this? Should i just replace it?

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Quote:
Originally Posted by kdsilvestri View Post
Check the coils. Replaced mine, cheap repair, and the Ranger is running significantly better.
Im wondering if it is the coils.


On another note The codes i read saying o2 sensor reads bank 1 lean. So that means the o2 sensor is working, not that its bad right?
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Last edited by 450thumper; 08-17-2018 at 03:33 PM.
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  #19  
Old 08-18-2018, 01:15 AM
Undrstm8ed Undrstm8ed is offline
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Default Re: What could cause this misfire

You may have some dirty injectors... that would both make idle rough and show lean condition as well. Try running a can of Berrymans injector cleaner through it along with a tank of 93-94.

If thats the issue you may wanna reconsider where you get your gas from and or running the cheap shit in it "no mas !"
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  #20  
Old 08-18-2018, 05:14 AM
KenHigg KenHigg is offline
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Default Re: What could cause this misfire

Does the truck have and egr system? if so it may be stuck open. You can sometimes test it that at idle by unplugging the solenoid. There should be no erg gases passing into the intake at idle. Second, is there an idle air controller? It could also be sticking closed. Sometime a quick cleaning can cure that...
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  #21  
Old 08-18-2018, 05:19 AM
tomw0 tomw0 is offline
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Default Re: What could cause this misfire

Have you cleaned the throttle body in the recent past? I had a very weak cold idle for the longest time. Never threw a code, but would stumble and hesitate until it was warmed up, ALWAYS.
I took off the throttle body, cleaned that while off, and then squirted carb/intake cleaner all over the inside of the upper intake. Of course the cleaner ran down into the lower, so I let it sit there for 20-30 minutes, and then put things back together.
It improved the cold start, and the idle after leaving a cloud of cleaner smoke on first startup.
I also had a vacuum(?) line under the upper intake, right near the injector fuel rail, that I pushed onto its' fitting more while I had stuff apart. I had an intermittent misfire where it seemed 2-3 cylinders were shutting off that I was chasing. I went so far at to remove the injectors and inspect the screen at their inlet(clean). Upper intake was removed for that procedure, and I found a hose that was not on tight, but cannot remember the details. Made sure it was on tight, and the cold idle improved significantly, even more than the intake cleanup. As I remember, the hose was attached to the lower side of the upper intake, sort of in that portion where the upper is horizontal, more or less.
tom
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  #22  
Old 08-20-2018, 06:13 PM
450thumper 450thumper is offline
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Default Re: What could cause this misfire

Hey guys im back, so i have now replaced the o2 sensor as well. It actually seems to have made a little difference. But not completely fixed my cold start misfire under load. Again it idles ok when cold just when im going to take off it misses. Untill it warm its fine.

Again ive replaced the AIT and checked for vacume leaks.
Replaced O2 sensor.
Good plugs and and wires.

No more prior codes but here is my new code. Any ideas what this means?


Im planning on pulling plugs and checking what they look like. Also possibly compression check just to rule serious issues out. Its just the truck runs so well once warm.

Also the rpms dont jump up when i put the a/c on anymore, what controls that? Crank sensor?

----------

Ok so i think that p1000 code pops up because i have recently cleared codes with scan tool and or i have dissconected the battery there reset codes.
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  #23  
Old 08-20-2018, 06:50 PM
KenHigg KenHigg is offline
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Default Re: What could cause this misfire

This means you need to complete some more drive cycles. In some case you have to go so many miles an hour with the engine at certain temps, etc, etc. In short what it amounts to is the initial test that it ran and failed is only run every so often under certain conditions to begin with. It is not continuously running the test. So you may have to duplicate the driving cycles / conditions multiple times and the test pass for the monitor / cycle test to clear. This keeps people from clearing codes and running straight to the emission test center...
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  #24  
Old 08-21-2018, 08:09 AM
tomw0 tomw0 is offline
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Default Re: What could cause this misfire

The IAC - Idle Air Control - adjusts and fiddles with the idle speed when cold, when the A/C compressor is slated to be turned on, and when you move the steering wheel, as when parking.{engine running at idle, and added load of the pump}
If you don't get a good fast idle at cold start, check the IAC, the ECT and the ACT. May have changed the names, but ECT is engine coolant temperature, and ACT is air coming in temperature.
With that info, the computer should nudge the IAC to bump the cold idle, AND add some extra squirt time to the injectors as cold engine, cold air, cold coolant will not atomize fuel as well when spritzed as when the cylinder head is up to temperature.
There is supposed to be a flap on the air box, vintage dependent, that opens and closes to divert air from the 'heat stove' around the exhaust manifold to the intake vs the cold air from out by the grill. Some have it, some may not. If that temperature operated valve does not work, then you never get warmed air to feed the engine when it is cold outside.
tom
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  #25  
Old 08-21-2018, 08:33 AM
KenHigg KenHigg is offline
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Default Re: What could cause this misfire

You mentioned you had a hose disconnected and plugged it, I think this could be causing the issues. Where did the line go?
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  #26  
Old 08-24-2018, 08:49 PM
450thumper 450thumper is offline
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Default Re: What could cause this misfire

Quote:
Originally Posted by KenHigg View Post
You mentioned you had a hose disconnected and plugged it, I think this could be causing the issues. Where did the line go?
That was going to the box on drivers side under battery. Believe it was for a gas return. Emissions related. But i replaced the house and hooked it back up.

----------

Quote:
Originally Posted by tomw0 View Post
The IAC - Idle Air Control - adjusts and fiddles with the idle speed when cold, when the A/C compressor is slated to be turned on, and when you move the steering wheel, as when parking.{engine running at idle, and added load of the pump}
If you don't get a good fast idle at cold start, check the IAC, the ECT and the ACT. May have changed the names, but ECT is engine coolant temperature, and ACT is air coming in temperature.
With that info, the computer should nudge the IAC to bump the cold idle, AND add some extra squirt time to the injectors as cold engine, cold air, cold coolant will not atomize fuel as well when spritzed as when the cylinder head is up to temperature.
There is supposed to be a flap on the air box, vintage dependent, that opens and closes to divert air from the 'heat stove' around the exhaust manifold to the intake vs the cold air from out by the grill. Some have it, some may not. If that temperature operated valve does not work, then you never get warmed air to feed the engine when it is cold outside.
tom
Thank you for the great advice!

----------

Quote:
Originally Posted by KenHigg View Post
This means you need to complete some more drive cycles. In some case you have to go so many miles an hour with the engine at certain temps, etc, etc. In short what it amounts to is the initial test that it ran and failed is only run every so often under certain conditions to begin with. It is not continuously running the test. So you may have to duplicate the driving cycles / conditions multiple times and the test pass for the monitor / cycle test to clear. This keeps people from clearing codes and running straight to the emission test center...
Got it! Thank you
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  #27  
Old 08-25-2018, 03:53 PM
KenHigg KenHigg is offline
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Default Re: What could cause this misfire

Cool - glad you have it fixed.
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  #28  
Old 08-26-2018, 10:39 AM
450thumper 450thumper is offline
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Default Re: What could cause this misfire

Quote:
Originally Posted by KenHigg View Post
Cool - glad you have it fixed.


Lol well i dont exactly have it completely fixed. Still having misfire under load at idle.
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  #29  
Old 08-26-2018, 11:55 AM
KenHigg KenHigg is offline
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Default Re: What could cause this misfire

Have you disconnected the egr valve. It is supposed to be closed at idle and can stick open. The scanner may give you some erg data.
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