|
1992 Ford Crown Victoria DTC 189 rich adaptive limit reached /system lean
1992 Ford Crown Victoria rich adaptive limit reached system lean. Hi thx in advance for your time, my car only during city driving under 30 mph, occasionally gives me a code, which I pull with my personal scanner, DTC 189, which the book says, rich adaptive limit reached during partial wot, system lean.
The engine light comes on for 5sec, then off, this only happens on the first cold drive, then doesn't the rest of the day, sometimes it doesn't for 2-3 days. The car has been well maintained, never any perf issues. 2 mechs say ignore as they can't figure it out. Any help appreciated.
BTW... my smog check is around the corner and I have to make sure I pass the smog test.
Answer:
|
Your 1992 Ford Crown Victoria could be showing a DTC 189 for several reasons. The problem is simply a lack of fuel reaching the combustion chambers. You want to look into things which would restrict fuel delivery such as dirty fuel injectors, dirty fuel filter, low fuel pressure due to defective fuel pump... the list goes on. These are just a few of the mechanical faults which can cause low fuel delivery (lean fuel) issues. Once these components are inspected for proper operation, the diagnosis should continue on to your Ford Crown Victoria's electronic sensors.
Defective fuel feedback sensors will disrupt fuel delivery as well. Our best recommendation would be to allow only a smog check repair certified mechanic inspect your vehicle for a lean fuel mixture problem.
One important diagnosis point we should mention however is since the problem appears to be teprature related you may want to inspect the ECT. If the ECT (coolant temperature sensor) is not operating properly (not sending the correct voltage signal to the Engine Control Module) the ECM will not be able to properly calculate how much fuel to deliver to the combustion chambers. When the engine is cold the ECM is programmed to deliver a richer fuel mixture (more fuel). As the engine warms up, the ECM will lean out the mixture. Insuring the ECT is sending the correct voltage to the ECM is important for correct air/fuel ratio (optimum is 14:7).
posted by SmogTips Support
|
|
|
|
|
View SmogTips.com in:
Desktop
/ Mobile
SmogTips.com © 2024 All rights reserved
