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Highway power loss #5295384 12/15/19 07:21 PM
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HyundaiAbuser Offline OP
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So on a hunting trip yesterday i was driving my 94 mazda B4000 on the highway when suddenty it started slowing down. I floored it but the engine would rev very slowly and slowed to about 1.2k rpm and 40 mph. Then after a minute or so it went back to normal. This happened 4 more times as i drove it home. When i got back i scanned the codes (ford obd1)
181 HEGO (HO2S) sensor fault unable to switch/lean during part throttle
185 Mass airflow sensor below normal
186 Fault in fuel injector pulse width circuit / high
189 which reads the same as 181
114 air charge temperature sensor higher or lower than expected voltage

All of these are new codes along with a 327 EGR valve position circuit below minimum voltage which has been there awhile without problem.
Something interesting extra to note is when filling up i have noticed sometimes gas spills from either the tank or the filler tube.

Any and all help would be appreciated on this im looking to pressure test the fuel system soon if i can.


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: Highway power loss [Re: HyundaiAbuser] #5295396 12/15/19 07:37 PM
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HyundaiAbuser Offline OP
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could this be as simple as a fuel filter?


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: Highway power loss [Re: HyundaiAbuser] #5295399 12/15/19 07:38 PM
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Propflux01 Online Crying
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My thinking as well.The codes being a result.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
Re: Highway power loss [Re: HyundaiAbuser] #5295529 12/15/19 10:49 PM
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sloinker Offline
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Unplug the MAF and see if it helps at all. Cheap easy check. Also note if the vehicle runs OK while cold and then gets erratic after it reaches operating temperature. This also indicates a sensor problem. Free checks before you start throwing parts at it.


'16 Tiguan TSI Vaico 5W40
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'14 Dodge Grand Caravan 3.6 Red Line Blue Label 5W20
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Re: Highway power loss [Re: HyundaiAbuser] #5295593 12/16/19 02:43 AM
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ctechbob Offline
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Broken up cat can cause similar symptoms as well. Easy enough to check.


2008 Acura TL Type S-165k
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Re: Highway power loss [Re: ctechbob] #5295652 12/16/19 06:37 AM
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HyundaiAbuser Offline OP
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Originally Posted by ctechbob
Broken up cat can cause similar symptoms as well. Easy enough to check.

how might i check a broken up cat?


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: Highway power loss [Re: HyundaiAbuser] #5295653 12/16/19 06:38 AM
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HyundaiAbuser Offline OP
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Also i am certain it is long overdue for a fuel filter so i was planning to do that anyways.


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: Highway power loss [Re: HyundaiAbuser] #5295664 12/16/19 06:45 AM
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aquariuscsm Offline
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I was thinking MAF sensor as well.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
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2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 0W20

Re: Highway power loss [Re: HyundaiAbuser] #5295860 12/16/19 10:38 AM
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AntsinmyEyes Offline
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Originally Posted by HyundaiAbuser
Originally Posted by ctechbob
Broken up cat can cause similar symptoms as well. Easy enough to check.

how might i check a broken up cat?





1987 mazda rx7
2004 mazda rx8
1995 miata
2005 dodge ram
Re: Highway power loss [Re: HyundaiAbuser] #5295922 12/16/19 11:54 AM
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Superflan Offline
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Fuel filter, air filter, MAF...


‘01 Peugeot Partner 1.9 D, 15W40 E7, 270000 Km, running on WVO
Wife's '19 Suzuki Vitara 1.0 Boosterjet (TGDI), 5W40 A3/B4, 18000 Km
Backup ‘01 Toyota RAV4 3-dr 2.0 VVTi, 5W40 A3/B4, 16?000 Km
Re: Highway power loss [Re: HyundaiAbuser] #5296114 12/16/19 03:48 PM
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I tried to order a fuel filter for my LS400 at the Lexus dealer while I was diagnosing a similar problem.

The parts manager said... "I don't know what your're trying to fix, but I guarantee you don't need a fuel filter."

He proceeded to tell me that in all the years he worked at the dealer, not one LS400 ever needed a replacement filter.

He was right... It was spark plug wires.


15 Toyota Prius - M1 EP 0w20 SN+
06 Acura MDX - M1 EP HM 5w30 SN+
02 Toyota ECHO - Valv MaxLife Syn 5w30 SN
97 Lexus LX450 - M1 EP HM 5w30 SN+
93 Lexus LS400 - M1 EP HM 5w30 SN+
Re: Highway power loss [Re: HyundaiAbuser] #5296125 12/16/19 04:02 PM
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The fuel filter will first be noticed as it starves for gas at high rpm and wide open throttle. Back off a little and it should start going OK again.

Likely the IAT and the MAF are inside the same unit here. When the PCM decides a sensor has failed it goes into a compensatory mode to run as best it can without that sensor so you can get home (or to the nearest dealer). This is probably why it picked up and ran better.

Re: Highway power loss [Re: HyundaiAbuser] #5296210 12/16/19 05:36 PM
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pschnahc Offline
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+1 on Check the MAF and associated wiring

Re: Highway power loss [Re: HyundaiAbuser] #5296315 12/16/19 07:25 PM
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HyundaiAbuser Offline OP
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i just cleaned the maf sensor however due to snowy conditions i havn't driven or really tested it yet. I will drive it to work tomorrow morning and update you guys on the situation.


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: Highway power loss [Re: HyundaiAbuser] #5296317 12/16/19 07:27 PM
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red7404 Offline
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my dad had the habit of saying check the cheapest and easiest things first.

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