MAF and MAP numbers
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MAF and MAP numbers
2006 Dakota 4wd Auto with the 4.7 (not the H.O.) I have a p0430, p0420, and a p2098. No vacuum leaks as far as I can tell, seems to idle fine, a little sluggish up the hills. Tried leaving the battery out of the truck for a day, came back the next drive. Spark plugs are extremely white from heat and no soot on the back of the throttle. I'm gonna hook it up to a scanner at work tomorrow and watch the MAF, MAP, and all 4 o2 sensors. Anyone have any idea what values I should be looking for, rough area? Don't really know much but what the pattern of the upstream o2 sensors should look like compared to the downstream. Also don't know if this will help any but had a major exhaust leak at the manifolds on both sides, had them fixed, cleared the codes a ton of times and they came back. I thought maybe the computer just needed to adjust but I appear to have been wrong. Any help is appreciated. Thanks!
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Joined: Nov 2021
Posts: 80
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From: Fulton, NY (Planet Earth)
Upstream O2 sensors should bounce up and down fairly rapidly. They are the sensors that control the air fuel mixture in an attempt to get "just the right" mixture of fuel to the air the engine is bringing in. Depending on the scan tool being used. Sometimes the scan tools have a slow 'refresh' rate, and it will look more like a roller coaster.
Downstream O2 sensors from my understanding should be fairly constant without a lot of 'wiggle' ups and downs. The fact you have the P0420 and P0430 code does not bode well for your converters. We're also dealing with a P0430 code for a bad converter. Last owner used a LOT of cheap eBay parts--including the O2 sensors. These engines demand high quality factory OEM sensors, and the cheap knock off ones will slowly either run the engine to rich or lean. We used Denso's for the ones we replaced. Cost wasn't bad on RockAuto and it did cure a "too rich bank 2 code" the eBay O2 sensor was throwing. (Sadly it's to late for that converter...)
Getting the manifold leaks fixed is 100% the right thing to do. If you have leaks before the first O2 sensor it can really play up with your fuel trims.
The P2098 has me scratching my head a bit. Here's a good read on that. It's more 'general' but might be helpful: P2098 — Ricks Free Auto Repair Advice Ricks Free Auto Repair Advice | Automotive Repair Tips and How-To
Good luck with it!
S-
Downstream O2 sensors from my understanding should be fairly constant without a lot of 'wiggle' ups and downs. The fact you have the P0420 and P0430 code does not bode well for your converters. We're also dealing with a P0430 code for a bad converter. Last owner used a LOT of cheap eBay parts--including the O2 sensors. These engines demand high quality factory OEM sensors, and the cheap knock off ones will slowly either run the engine to rich or lean. We used Denso's for the ones we replaced. Cost wasn't bad on RockAuto and it did cure a "too rich bank 2 code" the eBay O2 sensor was throwing. (Sadly it's to late for that converter...)
Getting the manifold leaks fixed is 100% the right thing to do. If you have leaks before the first O2 sensor it can really play up with your fuel trims.
The P2098 has me scratching my head a bit. Here's a good read on that. It's more 'general' but might be helpful: P2098 — Ricks Free Auto Repair Advice Ricks Free Auto Repair Advice | Automotive Repair Tips and How-To
Good luck with it!
S-