Need help interpreting AE truck data... - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 6 (permalink) Old 09-24-2019, 10:39 PM Thread Starter
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Need help interpreting AE truck data...

Just got AE Ford bundle and trying to learn fast. I have been having a loud squeal accelerating from about 1500 rpm to about 2200. The sequel goes away after 2000+rpm. (Appears unrelated to my other whine noise mentioned in my other post). Although the truck drives great with good power, I noticed that a random check of boost psi today showed very low. The dummy gauge on the cluster moves up to about 22psi, but I'm maxing on the digital obd2 gauge of about 4.2psi. That's at 3000rpm almost full throttle up a hill. No MIL or codes showing either. I've checked all up pipes and manifolds for soot leaks, they look clean. Did the quick vgt arm check KOEO, it moves normal. CAC boots look good. I've included a quick snapshot of AE readings at idle. Why is the MAF so high and red? Also, is MAP ok, it seems to balance out with EBP at idle I think.
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Early 99 (build 04/98) F250 XLT Supercab, 7.3 PSD, 4x4, 4R100, SRW, 6637 DIY intake, 4" TB exhaust, RCD leveling kit, 05 front facelift, 05 tow mirrors, 05 body badging, 05 Dash, Body molding delete, Difuser headlight harness, 20x10 XD Diesels(black), 305/55/20's, Stainless brake lines, Updated PCM, White face gauge overlay, 2002 seats.
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post #2 of 6 (permalink) Old 09-26-2019, 07:48 PM
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Re: Need help interpreting AE truck data...

Early,

The squeal you mention sounds like belt squeal... You might check your belt for wear/quality. Do you have the AC on? I would guess that it is either the alternator or AC pulley slipping. It could also be a bearing, but where the noise occurs during a specific rpm band I'd lean more to slippage.
On the OBD readout... I got myself a FORScan compliant unit and depending on which PID I look at I see different readings.. Perhaps your just not looking at the right PID yet. Personally... the dummy gauges are the OBD PIDs... having real mechanical gauges is the better way to get correct info.

Cj

1997 F350 CCLB 7.3, Eaton Fuller RTO-6610, 4x4, 3.54, otherwise stock
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post #3 of 6 (permalink) Old 09-27-2019, 03:21 PM Thread Starter
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Thank you for the info. I realized how poor the picture quality was after resizing to fit the post. Sorry about that. No AC on while this squeal happens. It definitely only occurs around low rpms and ends promptly around 2200rpm. Belts looks good and no squeals or squeaks at idle. But I will look it all over again and double check.

Early 99 (build 04/98) F250 XLT Supercab, 7.3 PSD, 4x4, 4R100, SRW, 6637 DIY intake, 4" TB exhaust, RCD leveling kit, 05 front facelift, 05 tow mirrors, 05 body badging, 05 Dash, Body molding delete, Difuser headlight harness, 20x10 XD Diesels(black), 305/55/20's, Stainless brake lines, Updated PCM, White face gauge overlay, 2002 seats.
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post #4 of 6 (permalink) Old 09-27-2019, 04:11 PM
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Re: Need help interpreting AE truck data...

Early,

You still have an alternator on the belt, which depending on the health of the batteries can put a fair load on the belt. After you have driven the truck for a bit does the squeal go away?

Cj

1997 F350 CCLB 7.3, Eaton Fuller RTO-6610, 4x4, 3.54, otherwise stock
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post #5 of 6 (permalink) Old 09-30-2019, 06:51 AM Thread Starter
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The squeal seems too overall be present, whether the truck is warm, cold, charging,
etc. Thought maybe a belt tensioner too? The belts look good, but I'm not sure if the tensioners have ever been replaced. Not sure on the alternator either. Cant remember if you can change the pulley on those or if you have to replace the whole alternator? My 7.3 alternator included a new pulley. The batteries are only about 6 months old from what I can tell, so they seem to be good. When driving/accelerating, I can kind of "tickle" the squeal and bring it on/off more or less by lightly blipping the throttle. Definitely rpm sensitive right around 2200rpm. Disappears promptly after that rpm range. Definitely a loud squeal that anyone in or near the truck can hear. Kind of a shriek sound.

Early 99 (build 04/98) F250 XLT Supercab, 7.3 PSD, 4x4, 4R100, SRW, 6637 DIY intake, 4" TB exhaust, RCD leveling kit, 05 front facelift, 05 tow mirrors, 05 body badging, 05 Dash, Body molding delete, Difuser headlight harness, 20x10 XD Diesels(black), 305/55/20's, Stainless brake lines, Updated PCM, White face gauge overlay, 2002 seats.
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post #6 of 6 (permalink) Old 09-30-2019, 06:56 AM Thread Starter
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I'll take a closer look at the belt tomorrow. Maybe it is in fact slipping. I wonder if the tensioners weeken over time, if that could add to slippage? I always assumed a squeak or chirping from the tensioners going bad, but maybe lack of tension instead? Thanks for your help and insight.

Early 99 (build 04/98) F250 XLT Supercab, 7.3 PSD, 4x4, 4R100, SRW, 6637 DIY intake, 4" TB exhaust, RCD leveling kit, 05 front facelift, 05 tow mirrors, 05 body badging, 05 Dash, Body molding delete, Difuser headlight harness, 20x10 XD Diesels(black), 305/55/20's, Stainless brake lines, Updated PCM, White face gauge overlay, 2002 seats.
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