Wierd fuel problem during boost!
This problem just happend out of nowhere...
car runs fine during idle and low load(vacuum) but as soon as boost hits about 10psi the car runs pig rich (10afr instead of the 12 it was tuned to) and it wont boost as much as it is tuned to do... idle is still about 13 and cruise 14-15 haltech ps1000, fpr, smartcoils, big turbo and so on can anyone please shoot some ideas at me :-) |
12 is a little lean for a turbo rotary under boost. Its safer to be in the low 11s. That being said, what changed? If the water and air temp tables weren't tuned correctly the afrs could change with the weather. You could also have a bad water or air temp sensor. An ignition problem would also make the car run richer as fuel wouldn't be burnt.
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water and air temps are the same and the readings are good, guess i should check my timing and spark but i did try and change sparkplugs with no succes
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Also anything that may have altered the volumetric efficiency could cause it to run rich. like engine damage...
but I'd look at sensors/ grounding/ wiring first |
ok i double checked the sensors, they are fine. I also checked the battery voltage and found out that it only is 12.5 volts when the car runs and the alt is getting kinda hot....could this be teh problem?
I also tried to just lean out over all trim map by a few % but then the car runs like shit on vacuum/light load I also ran some new ground wires and a new wire from alt to battery. No change at all.....wtf is this! |
Originally Posted by rx7jocke
(Post 11778423)
I also checked the battery voltage and found out that it only is 12.5 volts when the car runs and the alt is getting kinda hot....could this be teh problem?
You'll be needing to find a solution to your charging problem, really before you go any further with diagnosis. That is because the engine management relies on the voltage being good to make accurate calculations. as far as what is wrong, May just be an alternator, but could be something else, so it would be best to test before replacing. Victor |
Datalogs are you best friend. Get a datalog and post it.
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