Negative long-term fuel trim (LTFT) is a condition where your vehicle’s computer has made adjustments to the air-fuel mixture delivered to … See more There are a number of things that can cause negative LTFT, but the most common is a problem with one of your engine’s sensors. The three most likely candidates are the mass air flow sensor (MAF), oxygen sensor … See more Normal long-term fuel trim is a measure of how much fuel the engine is receiving compared to what it needs. It’s expressed as a percentage, and 100% means the engine is getting … See more The first step in fixing negative LTFT is to have your vehicle’s computer scanned for codes. This will help you narrow down which sensor is causing the problem. Once you know which … See more WebJan 31, 2024 · High negative fuel trims mean the PCM is taking fuel away, trying to compensate for a rich condition. Maybe leaking injectorS, since you indicated both banks are involved. Reply Like # 4 06-30-2024, 11:24 PM stkelly New User Thread Starter Join Date: Jan 2006 Posts: 16 Likes: 0 Received 0 Likes on 0 Posts
Fuel trim analysis & MAF testing Vehicle Service Pros
WebNegative Fuel Trim Indicators Ron Bilyeu Tech Tip AVI ON DEMAND 13K subscribers 23K views 8 years ago From LS-54 Diagnostic Strategies: Ignition & Misfires, As with Part 1 on Air... WebJan 1, 2024 · The long-term fuel trim (LTFT) is the accumulated data from the short-term trims. This is the historical record from the O2 sensor feedback. This long-term fuel trim information is stored in fuel trim cells, which are data … smackdown bleacher report september
Yeah, but what are your fuel trims? — 27WON Performance
WebMy understanding of negative fuel trim is that the computer thinks there's too much fuel (or not enough air) in the fuel ratio so it subtracts the amount of fuel supplied, thus showing a negative reading. Am i correct in this? Based on that assumption, I suspected a leaky injector leaking too much fuel into cylinder 2. WebJun 12, 2024 · When idling, trims just go way negative and then once warm, the jerking and hesitation occurs. Dealer indicated the O2 sensors were good. New sensors like MAF, MAP pre, MAP post, air charge, etc. So, picked up a second ECU to flash a stock tune (factory from scratch to be sure the "stock" tune in the car really was stock). WebApr 30, 2024 · A negative fuel trim percentage indicates a taking away of fuel while a positive percentage indicates an adding of fuel. A normal long-term fuel trim reading will … smackdown bleacher report july