01-31-2015 | #1 |
Join Date: Oct 2011
Location: Shalimar, FL
Posts: 192
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ECM Code 55
Runs great until 5000 RPM then terrible.
Manual says "System Lean Monitor" Does this mean the O2 sensor is bad? I did not see a diagnostics chart for this code in section 8. 91 with the usual mild mods, secondaries pulled, 37K miles. I did a search for "Code 55" but the search engine says 55 is too common. Thanks |
01-31-2015 | #2 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,193
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Re: ECM Code 55
Check fuel pressure, might have a bad pump or hose is off pump
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
01-31-2015 | #3 |
Join Date: Oct 2011
Location: Shalimar, FL
Posts: 192
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Re: ECM Code 55
Going to reset and drive it again. If it happens again I will chk FP.
Thanks Lee |
01-31-2015 | #4 |
Join Date: Aug 2005
Location: Northridge, CA
Posts: 1,460
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Re: ECM Code 55
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Last edited by tf95ZR1; 01-31-2015 at 11:57 PM. |
02-05-2015 | #5 |
Join Date: Aug 2007
Location: Barcelona, SPAIN
Posts: 41
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Re: ECM Code 55
Check Fuel Pump 2 fuse which is located on the auxiliary fuse panel. On the passenger footwell, remove the cover and look under and you will see a small panel with some fuses. One is marked FP2, check it.
If Fuel Pump 2 does not run, you don't have enough fuel on Full Power mode when the engine is WOT and this causes the lean problem. |
02-08-2015 | #6 | |
Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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Re: ECM Code 55
Quote:
Generally, it means your engine is running out of fuel at WOT. Be careful with that and no secondary port throttles. You can burn pistons and valves in a heartbeat. Either the fuel filter is restricted, the fuel lines are restricted or the secondary fuel pump is not working.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
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02-16-2015 | #7 |
Join Date: Oct 2011
Location: Shalimar, FL
Posts: 192
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Re: ECM Code 55
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02-16-2015 | #8 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,193
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Re: ECM Code 55
We don't need no stinkin manuals
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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