troubleshoot me this - cold start runs rich
10-17-04, 07:23 PM
#1
Wankler
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troubleshoot me this - cold start runs rich
Anyone got any leads on this one/can identify the issue...
93 FD (JDM) runs like **** when engine is cold - started with a slightly louder exhaust note and rapid backfire on deceleration, has now degenerated to a rough idle, black smoke, noisy exhaust, noisy engine, more backfires.
Once she heats up (about 4-5 minutes) runs like a dream - all symptoms disappear. Boost and power are perfect.
Swapped out the plugs - but problem only got worse.
Any ideas??
93 FD (JDM) runs like **** when engine is cold - started with a slightly louder exhaust note and rapid backfire on deceleration, has now degenerated to a rough idle, black smoke, noisy exhaust, noisy engine, more backfires.
Once she heats up (about 4-5 minutes) runs like a dream - all symptoms disappear. Boost and power are perfect.
Swapped out the plugs - but problem only got worse.
Any ideas??
10-18-04, 01:20 AM
#2
Wankler
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no ideas? too hard?
it's a strange issue - as, while don't have the ability to test the a/f ratios - it isn't obviously running rich when warmed-up. ie: lots of smoke when cold - not even a puff of the black stuff under WOT
it's a strange issue - as, while don't have the ability to test the a/f ratios - it isn't obviously running rich when warmed-up. ie: lots of smoke when cold - not even a puff of the black stuff under WOT
10-18-04, 05:39 AM
#4
1JZ powered
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If you run the Power FC, there is an engine fuel enrichment setting that multiplies your base map by 1.XX to intentionally run the car rich. This way, it will make your car warm up faster and make it run a little smoother upon startup.
10-18-04, 06:34 AM
#5
Wankler
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no, stock ecu (as far as I've ever been able to tell - definitely not pfc, anyway).
they're ringing mazda japan tomorrow, but I'd really appreciate a few tips anyway, if anyone has any idea what sort of part failure, etc, would cause this
they're ringing mazda japan tomorrow, but I'd really appreciate a few tips anyway, if anyone has any idea what sort of part failure, etc, would cause this
12-17-04, 06:24 AM
#7
The Laser Man
have you ever tried a difference stock ECU??
I had a friend who had boost problems and he had a stock ECU....
came out to be the ECU was bad.... maybe you can try that first.
I had a friend who had boost problems and he had a stock ECU....
came out to be the ECU was bad.... maybe you can try that first.
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12-17-04, 09:07 AM
#8
DinoDude
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At cold start your engine is supposed to run rich. The engine coolant temp sensor has "high authority" & when it says "cold", it tells the computer to give the car more fuel. One possibility is the coolant sensor is not reacting, not backing down on enrichment as the car warms up.
When the car fully warms up, the O2 sensor has gotten hot enough to work, and the car goes into closed loop with the O2 sensor running the show. Until that happens, your coolant temp sensor and your throttle position sensor are the major players.
When the car fully warms up, the O2 sensor has gotten hot enough to work, and the car goes into closed loop with the O2 sensor running the show. Until that happens, your coolant temp sensor and your throttle position sensor are the major players.
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