Poor running P38 4.6 v8 after Wading

3251 Views 15 Replies 6 Participants Last post by paul.adshead, Jan 3, 2010

suezee g

Discussion Starter · Jan 1, 2010

Hi, Can any one help?, spent day off roading with no problems until last flood, powered through flood and got through ok, engine stuttered after 100 metres lost power, regained power for moment then lost it, got on road with on/off power to 45mph first hills down to under 20mph, continued to drive for few miles, stoped at Services. Air filter was wet, removed it and cleaned air box. Engine starts and sounded smooth on tickover but wouldnt rev with full power. Continued to drive for few miles got worse, stoped and noticed LH Cat was glowing bright red, got home on tow rope. Next day checked plugs, full spark on all, runs with no knocks or vibrations but wont rev past 2-3000rpm. Has anyone go any ideas ??? Air flow meter? Lambda sensor? cat?

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leftlanetruckin

· #2 · Jan 1, 2010

Glowing cat could mean a blocked cat IMHO.
Check the cats and the o2 sensors.
A blocked cat would give the symptoms you are experiencing.

Martin

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leftlanetruckin

· #4 · Jan 2, 2010

To check the cats, easiest way is to remove them. Then you can either physically look into the cat, test drive without them, or both! You need a multimeter to check the o2 sensors.

Martin

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leftlanetruckin

· #8 · Jan 2, 2010

kmagnuss said:
leftlanetruckin said:

You need a multimeter to check the o2 sensors.

Martin

Click to expand...

False. You need an oscilloscope.

I thought they gave off a voltage, at least mine do according to faultmate......... :thumb:

Martin

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leftlanetruckin

· #11 · Jan 3, 2010

kmagnuss said:
They do give off a voltage...but it's a very fast up and down change, and can only be caught by an oscilloscope. The multimeter just sort of tells you it's on...not that it's in range.

Ahh ok, I have tested them before on Jeeps after motor swaps etc, but my multimeter has a memory function where it will record the data then play it back through the laptop in a graph format.
And the faultmate gives the reading for the o2 sensors on the Rover, so I guess I took it for granted!

Martin

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leftlanetruckin

· #13 · Jan 3, 2010

I cannot find it on Craftsman anymore, but it is something like this one, but with "Craftsman" on it.......
http://www.justhandhelds.com/store/Sanw ... =245125381

Sorry for the OT.

Martin

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