EEC-IV code 41 and No Start
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EEC-IV code 41 and No Start
My trusty 1988 F-150 5.1 truck had been running a little rough lately. After a short drive to the store I got back in to leave, and she would not start. The starter sounded great. After a tow to the house (thanks for friends) I read the codes, and only have a 41. Haynes talks about HEGO, is this the oxygen sensor? I have read a few posts and I'm leaning that way. That will be the first thing I check.
Thanks in advance
Thanks in advance
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From: Central Florida, USA
EEC-IV code 41 and No Start
Yes, that is the Oxygen sensor. Seems like they would name it such. Have you seen black smoke from the exhaust lately? Has your gas mileage gone down lately? Those and rough running are all signs of a bad Oxygen sensor but that by itself usually will not cause your engine fail to start. That is unless this has been happing long enough to foul your plugs. I'd replace the oxygen sensor and pull a plug or two. If the plugs look fouled clean and re-gap or replace them and see if you can start your truck. We'll go from there.
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EEC-IV code 41 and No Start
First let me correct myself, engine size is 5.8 not 5.1. I checked the ohm's on the O2 sencer and it is at 6.2, and good to go as per Haynes. I have not seen any smoke at all. It has been running rough for awhile, so I will clean and gap plugs right now. No transportation right now.
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From: Central Florida, USA
EEC-IV code 41 and No Start
Now that points you in an entirely different direction (Still, if its been more than about 50-60 K miles on the existing oxygen sensor I'd think about changing it). Fuel regulator and IAC are the next things to check. If the fuel pressure regulator is not working you will have too much pressure on the injectors, they will run rich and the engine will be hard to start. You can check the pressure using the shrader valve on the fuel rail. Check your manual for the correct operating pressure. The Idle Air Control valve is on the side of the throttle body. When it gets fouled it will fail to regulate the engine at idle and rough operation or poor starting will result. While you are in there cleaning the IAC go ahead and clean the EGR return port. Both fuel pressure and IAC problems will give a oxygen sensor code (41) due to incorrect combustion and excessive waste (low oxygen) in the exhaust.
Post Fiend
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From: Memphis, TN
EEC-IV code 41 and No Start
HEGO is "Heated Exhaust Gas Oxygen sensor". A HEGO code rarely means a bad sensor - it usually means something is causing the exhaust to have an abnormal oxygen level. Could be as minor as a vacuum leak, or as serious as oil getting by the rings.
Check the ignition module, coil, & PIP according to a Haynes manual or here.
Check the ignition module, coil, & PIP according to a Haynes manual or here.
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EEC-IV code 41 and No Start
I had a meeting tonight so did not clean and gap plugs. In reference to the IAC, removing intake hoses and spraying carb cleaner into T/B while running cleared up prior rough idling. It has been awhile since the last time. I checked ohms on the IAC and again it is good as per Haynes.
I will clean the IAC, but need to know if it needs to come off or just spray carb cleaner in the T/B. OK need clue about cleaning the EGR return port. Thanks Michael.
I will look over the vacuum hoses, but do not know how to check my ignition module, and do not know what PIP means. Thanks Steve83
I will clean the IAC, but need to know if it needs to come off or just spray carb cleaner in the T/B. OK need clue about cleaning the EGR return port. Thanks Michael.
I will look over the vacuum hoses, but do not know how to check my ignition module, and do not know what PIP means. Thanks Steve83
Post Fiend
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From: Memphis, TN
EEC-IV code 41 and No Start
Profile Ignition Pickup - it's the hall-effect sensor under the rotor inside the distributor. The Haynes manual will explain more thoroughly.
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EEC-IV code 41 and No Start
Plugs are fine and gap is good. Realized my book was a Chilton, so went and bought a Haynes (What a difference)
. Started troubleshooting from Chapter 5. Now here is my question, I am checking for stray voltage at pin 2 of the ignition module plug (disconnected). I get 0.01 volts (multimeter is set on 20 volts DC), is this substantial? If not I am to change the ignition module. If so I need to track down the source. I tracked the wire in my new Haynes book back to the ECA (looks $$$).
Thanks to everyone for there inputs!
Kevin
. Started troubleshooting from Chapter 5. Now here is my question, I am checking for stray voltage at pin 2 of the ignition module plug (disconnected). I get 0.01 volts (multimeter is set on 20 volts DC), is this substantial? If not I am to change the ignition module. If so I need to track down the source. I tracked the wire in my new Haynes book back to the ECA (looks $$$).Thanks to everyone for there inputs!
Kevin
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Post Fiend
Joined: Nov 2002
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From: Memphis, TN
EEC-IV code 41 and No Start
To find out if it's accurate, set the meter to the same range (20V) and touch the leads. This is the definition of 0V, so if the meter still shows 0.01V, it's just meter error. Even if there's actually 0.01V, I doubt it's significant. Doesn't the Haynes say how much is too much?
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EEC-IV code 41 and No Start
I did touch the leads together, and got 0. The Haynes manual redas "No voltage should be indicated". I don't think it is substantial either, so I'll replace the ignition module. I let you know. Thanks.
Kevin
Kevin
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