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Misfire, Rough Idle & Poor MPG

Old 01-23-2014, 02:15 PM
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Default Misfire, Rough Idle & Poor MPG

Hello All,

2002 A4 1.8T...Blanca. Ran very well until...
last month I lost heat completely... 2weeks ago she started ideling rough and misfiring. now getting less than 250 miles on a full tank 15-16 MPG!

At idle the CEL flashed at me and I drove to the nearest shop. Dealership!
Diagnosed misfire in cyl 3 and intermitant misfires that seemed to move around. 3rd cyl consistantly. checked coils, were OK. replaced spark plugs...still misfiring. advised me to change injector in cyl 3 only...$400.

Blanca is APR tuned Stage 1. I purchased 4 TT225 injectors and reflashed to Stage 1+...$380. Blanca still misfires. disconnected MAF, no difference. looked for vacuum leaks, none visible.

Prior to loss of heat.
-blew coolant hose while driving and car shut down.
-replaced hose & CTS (green one)
-fan blowing immediately when car starts...it's been below 20 degrees much of the month. battery dead each morning.
-replaced battery

Any ideas on what could be wrong?
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Old 03-01-2014, 10:35 PM
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Default Re: Misfire, Rough Idle & Poor MPG

coil harness
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Old 03-18-2014, 03:47 PM
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Default Re: Misfire, Rough Idle & Poor MPG

Thanks petzl. You sound sure.
Found major leaking Breather hose, replaced... also replaced pancake valve and pump/valve on PCV system. Still misfire. The RPM when idling stays flat yet I hear the misfire. the car bogs below 3k RPM. Seems to open open up well beyond 3k RPM. Gas mileage is less than 12 MPG...was getting 22 to 26 MPG.
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Old 10-16-2016, 06:08 AM
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Default Re: Misfire, Rough Idle & Poor MPG

rabbit , did you find a resolution to this issue...?
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