New truck issues

grandpa Love · May 16, 2020

We bought an '05 F-250 gas burner last weekend. Drove it about 500 miles with no problems. When we went to pick up out hay tedder we hit a couple hard bumps in the road where a paving project is going on. The truck started to loose power and check engine light came on. Pulled over and tried to rev it up. Just spluttered and a couple muffled back fires. Turned it off. Waited a couple minutes then back on our way just fine for 15-20 miles then repeat the whole process. Took it to parts store , code reads clogged catalytic converter. Possible the hard bump knocked something loose in one of them? We undid battery and let truck sit over night. Drove it yesterday a couple miles with no issues. Any ideas? Lucky the old diesel is still happy to work and isn't in the barn for repairs yet!

Geo-TH,In · May 16, 2020

Year ago, my mom had the exhaust choked up with her old 1980's Caddy. Wouldn't go over 30 mph. So very possible the bump shook something loose.
geo.

RLA · May 16, 2020

The code reader read a stored code, so at sometime that was an issue // another thing that can happen after hitting or jarring something can move / dirt in the air cleaner asy & become stuck in the mass air flow sensor. Something as small as a fly wing can screw up the sensor's performance.. You an air hose blow gun & blow it out. We have people who change their own air filters & suddenly their vehicles doesn't run or doesn't run right at all.. They fine that mice have been there & the blow it all out, well they blow some back up into the intake hose.. Just a thought, but you might have a cat problem, a leaking injector can cause a converter to melt down & restrict flow.

Dennis Minn · May 16, 2020

Grnpa,

If it is a plugged cat, pull the o2 sensor upstream of it then see how it runs. It usually fairly easy to get to, but you have to have the right socket. Going to be noisy while the sensor is out.

D.

grandpa Love · May 16, 2020

rla, truck did come with a brand new air filter.... I guess wait and see if problem comes back then when light comes in it will only read one code?

Texasmark1 · May 16, 2020

You talking about that 400# blob GM referred to as a CCV? What a joke.

Blackhole49 · May 16, 2020

When my 05 3.0 Ranger had plugged converters at 100,000 miles (2016), it wouldn't run over 30 at all times. Took the converters off, punched the guts out of them and reinstalled, it has been running great since. Has 146,000 miles on it and the only issue is the check engine light has been on for 4 years.

Steve@Advance · May 16, 2020

Typical symptoms of a clogged converter, or restricted exhaust for any reason, it will idle, but not rev or make power, sometimes accompanied by whistling at the tail pipe.

In extreme cases it may not even start.

But it is almost always a permanent condition, not intermittent, not temporarily corrected by a restart. Removing the upstream o2 sensors will give pack pressure relief for a test.

Do you remember what the code was? There is no sensor to detect back pressure. A PO420 code is derived from the readings of the oxygen sensors trying to determine the efficiency of the cats. Other factors can also set that code, so don't condemn the cats just yet.

Try cleaning the MAF sensor, clear the codes, see what codes set when it happens again. Being it was caused by a sudden jolt, look for chaffed/burned wiring, loose connections related to the code set. Might try reseating the connector plugs on the ECM.

Sprint 6 · May 16, 2020

I have seen a cracked substrate in a catalytic converter cause intermittent no power issues, then it turned, allowed flow and power returned to normal. A cracked substrate will also cause a P0420 code.

Intermittent fuel pump armature binding is also an issue I see on Ford trucks from time to time. Can cause intermittent no starts and/or low power at times.

I think you said that is an '06? They have a fuel pump relay that is part of the printed circuit in the cab fuse block. Those are trouble prone, too. New Ford fuse block is the fix for that.

Bumps and jolts can induce, or "fix", any of these three issues.

grandpa Love · May 16, 2020

Quick update. Took cable off battery and cleared codes. Drove truck until check engine light came on. Took it to auto zone. Shows a fuel rail pressure sensor code.

kothoma2 · May 16, 2020

I have an 04 f150 which had same problem. It turned out to be the fuel pump module above the spare tire. It had severe corrosion and the rough roads would cause problems.

New truck issues

grandpa Love

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Geo-TH,In

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RLA

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Dennis Minn

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grandpa Love

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Texasmark1

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Blackhole49

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Steve@Advance

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Sprint 6

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grandpa Love

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kothoma2

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