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Another P0104 EGR Insufficient Flow Code Problem

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Old 10-21-2009, 05:42 PM
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Join Date: Oct 2009
Posts: 1
Another P0104 EGR Insufficient Flow Code Problem

First time to post, thanks in advance for any advice/suggestions.

Vehicle is 2002 Ford F-150 XLT Supercrew 4x4 with 4.6L, 150,000 miles

1. Two weeks ago Check Engine light came on. Last week pulled the code and it came up P0104 EGR Insufficient Flow.

2. This week engine cranked but failed to start a couple of times after short (less than 20 minute) drives. After 2 to 3 hour (or overnight) rest engine starts up fine, but occasionally still fails to start after short trips. When engine starts it runs smoothly.

Figured it was time to do something about these problems. Spent last two evenings running down the great suggestions and threads on this site relating to the EGR problem.

Went out this morning and performed the suck test on the EGR Valve. Wife thought I was nuts by the way lol! Anyway, engine idle DID change and engine almost died with mild draw down on tube attached to the nipple on top of EGR Valve where the green line was attached. Also checked all lines/hoses and did not find any unattached or burned lines.

1. Is it safe to assume at this point that problem is NOT with the EGR Valve?
2. Is it safe to assume that ports are not completely plugged?
3. Is it possible that starting problem is unrelated to EGR Code problem?
4. What is best next step? Replace DPFE Sensor?

Thanks again for any advice here.
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Old 10-21-2009, 08:31 PM
Technical Article Contributor
Join Date: Oct 2005
Location: MI
Vehicle: 1998 Ford F150 5.4L 4X4
Posts: 25,636
PO104 is generic, -never heard of that one coming up on a Ford, but it's -

Mass/Volume Air Flow Circuit~Intermittent

Sounds like the MAF sensor to me and yes , you'll have all kinds of starting/shifting and drivability issues if that's happening.


A 401? . If that's the case, punch PO401 into the search bar on this site for a wealth of information, pictures, diagrams,video and instruction.


Next step is to replace your problem = Maf Sensor
Windsor Built 5.4L, E40D, Transgo kit, 9.75 Rear gear, Brembo rotors, Carquest Blue's, Bilstein's, Ported & Polished Intake/TB, Denso Iridium's, Pace setter LTH's, Magnaflow HFC's, Magnaflow 20X9X2.5 HF Muffler, Type 3 19lb Injectors, Volant Intake w/Amsoil EEA191 Filter, 265/17 GY Fortera's.

Compression Testing Procedure

Last edited by jbrew; 10-21-2009 at 08:36 PM.
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