94 b4000 error codes - pinging problem - Mazda Forum

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Old 08-20-2010, 09:45 PM
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Default 94 b4000 error codes - pinging problem

The dealership said the codes were

111
181
184

They said O2 and EGR. I replaced both no change to problem.

The problem is heavy pinging on hills. I can reduce this with high octane gas but not get rid of it. The truck also lacks power. The engine light comes on instantly.

I cleaned the MAF without any change either.

----
I am sure the problem is unrelated but recently I started to smoke going up long hills at highway speed. It goes away once I level out.


help would be appreciated

tm
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Old 08-29-2010, 09:57 PM
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You probably need to replace the MAF. Use a dealer part, you can get the Motorcraft brand inexpensively through RockAuto Auto Parts.

You are pinging because the MAF is reading incorrectly, causing your engine to lean out.
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Old 09-01-2010, 11:12 AM
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Default Part ordered

Here the part costs about $300

I went and ordered from rockauto @ $60

thanks for the lead

tm
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Old 09-12-2010, 07:50 PM
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Default MAF installed

The check engine light takes a little longer to go on - but it still goes on.
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Old 09-25-2010, 09:50 AM
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Did you give us the right codes? Do you mean 171 and 174?
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Old 10-11-2010, 12:37 PM
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Default right codes

They are the right codes.
I may go back for a re-code.
The truck passed the local AIR_CARE service so emissions are fine.

I am experiencing new problems - I'll start a new - wtf-transmission thread


thanks for the help

tm
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Old 10-12-2010, 11:29 PM
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Best I can tell you, 181 and 184 are usually associated with a faulty MAF sensor. You can try cleaning, it, but it will probably need to be replaced.
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Old 10-16-2010, 03:11 PM
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I replaced the MAF.

Maybe the cam sensor? - a lot of $ to replace that.
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Old 10-22-2010, 08:32 PM
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I have new symptoms.
The trucks is now running incredibly rough.
I switched back to the old MAF and it made no difference.

If I rev the engine it will NOT rev any higher than 4000 and will surge massively at that point.

any thoughts?

tm
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Old 10-23-2010, 06:40 AM
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I think you have a bad MAF. If you replaced it with anything other than a Motorcraft sensor you are likely to have problems. I learned that the hard way. You don't have to get Motorcraft from the dealer, roackauto.com carries them. Before just popping for a new sensor, you should run a few tests on your old one, and check the wiring to make sure it is getting the proper reference voltage and such. I went through 2 aftermarket MAF sensors on my Aerostar, which is almost the same as your B4000, before I went with an OEM one. Even then I had an issue with the first dealer one being bad. They switched it out for another and all is well now.

If you are running a K&N or other oil coated filter, switch back to stock.
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