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Old 11-03-2010, 05:57 PM   #1
Fierysun
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2003 EJ207 S204 Wagon

Default What are the symptoms of a faulty fuel pump, FPR, and injectors?

I'm getting crazy IAM fluctuations from 16 to 4 along alot of FLKC and intermittent FBKC correction

I talked with my tuner and he provided a new map (based on all the logs i took).

After uploading the new map to the ECU and I went for an hour drive. The IAM is now down to 3.

The compression is good on the motor and I replaced the fuel filter (no effect).

What are the symptoms of a faulty fuel pump, fuel pressure regulator, and injectors?
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Old 11-03-2010, 09:10 PM   #2
quazimoto
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Do you have a wideband? The symptoms would be gradually running lean at WOT.
Fuel pressure regulator is easy to diagnose.......get a fuel pressure gauge.
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Old 11-03-2010, 09:29 PM   #3
dangerousatom
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If this is on your 03 its most likely the fuel pump. Like quazimoto said get or barrow a fuel gauge and install it rite after the fuel filter B4 the fuel rails.

I seriously doubt it your regulator.
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Old 11-03-2010, 09:31 PM   #4
dangerousatom
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If this is on your 03 its most likely the fuel pump. Like quazimoto said get or barrow a fuel gauge and install it rite after the fuel filter B4 the fuel rails.

I seriously doubt it your regulator.
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Old 11-04-2010, 04:10 AM   #5
Illicit1
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Check for anything loose in the engine bay that might be banging on the motor, your knock sensor will read this as false knock. Happened to me, IAM wouldn't stay at 16 for very long but when i cable tied the offending loose tgv sensor left over from a manifold swap it fixed the problem.
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Old 11-11-2010, 12:46 PM   #6
HTM WRX
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Quote:
Originally Posted by Illicit1 View Post
Check for anything loose in the engine bay that might be banging on the motor, your knock sensor will read this as false knock. Happened to me, IAM wouldn't stay at 16 for very long but when i cable tied the offending loose tgv sensor left over from a manifold swap it fixed the problem.
a loose connector banging against the motor is enough to set off the knock sensor? wow!

I guess i need to zip tie my tgv connectors also.
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Old 11-22-2010, 01:39 PM   #7
Phatron
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for the FP or FPR failing the ECU should start having +15% learnings in all ranges to account for the loss in fuel pressure.....

if a single injector is going the AFR may not swing enough......to check for a bad injector just let the car idle and start unplugging the injectors. If you unplug one and the idle doesnt change then you know that one wasnt spraying.
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Old 04-09-2012, 11:02 PM   #8
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Quote:
Originally Posted by Phatron View Post
for the FP or FPR failing the ECU should start having +15% learnings in all ranges to account for the loss in fuel pressure.....

if a single injector is going the AFR may not swing enough......to check for a bad injector just let the car idle and start unplugging the injectors. If you unplug one and the idle doesnt change then you know that one wasnt spraying.
Thats a kick ass tip.
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