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Old 11-30-2012, 10:51 PM   #1 (permalink)
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Default Bad or Clogged Injectors?

On tip in around 1800rpms and at other times when going from decel to quick throttle I get a lean condition and big bog for a second.

Also, at various times on decel my injectors are still open...creating a 13-15:1 AFR for the entire decel duration. Its random when they stay flowing...other times they shut off and AFR gauge goes - - -.
Any ideas? Injectors are 650cc w stock fuel system.
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Old 11-30-2012, 11:26 PM   #2 (permalink)
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Specific brand injectors? Have you logged the throttle position sensor and/or checked the wiring at the connector? Is this something new or have you done anything to the tune/calibration recently?
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Old 12-01-2012, 09:52 AM   #3 (permalink)
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Seimens injectors...been on the car for around 80k. Just started happening and I haven't logged TPS.
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Old 12-01-2012, 03:07 PM   #4 (permalink)
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On decel when the injectors stay open, both LTFT and STFT are maxed out -32....and car continues to stumble and read 13-15:1 AFR.

TPS volts are 0.00-0.01.
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Old 12-01-2012, 03:11 PM   #5 (permalink)
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Sounds like they aren't turning off.


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Old 12-01-2012, 05:40 PM   #6 (permalink)
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Depending on the sampling rate and logging, I've seen issues where the TPS is shorting out and you can't see it on OBD-II logs but can be spotted if you put it on a scope. It can take a long time (if ever) to trigger a code but is long enough for the computer to keep the A/C clutch from engaging and might cause it to not go into deceleration fuel shutoff. Another thing of the top of my head would be to check and see what the fuel pressure is doing and pull the plugs out to "read" them and see if one injector might be leaking.
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Old 12-01-2012, 06:17 PM   #7 (permalink)
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Thanks Eric...I'll try to check the TPS. I've been debating upgrading injectors anyway and sending these off for checking and then sell them.

Plugs are fairly old so I don't know if I could tell but I'll pull them tomorrow and post up pics
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