Engine - Poor Cold Performance and Code 44
87pontiac13Number 87-6 (Gasoline)-78 Date 11/87
Subject: COLD STALL, COLD PERFORMANCE AND CODE 44
1987 6000 AND GRAND AM MODELS EQUIPPED WITH 2.5L ENGINES
Some 1987 6000 and Grand Am models equipped with 2.5L engines may experience poor cold performance and code 44, and may not stay running. In order to diagnose this condition, observe the block learn and integrator readings on the scan tool. The readings will be high indicating lean exhaust condition.
Follow code 44 scan diagnosis in your Pontiac service manual section 6E2 or in the Alldata Fuel Injection section.
Perform fuel pressure check. If pressure is not within specification, repair fuel system as necessary. If fuel pressure is within specifications, restrict the fuel return line and watch your integration reading. Reading should come down. By restricting the fuel return line you have raised fuel pressure in the system which causes more fuel to be discharged from the injector. If you restrict the fuel line long enough integration and block learn will stabilize. This indicates a restricted fuel injector. Replace injector using the applicable labor operation number and time.
NOTICE: The block learn reading may be at 128 reading while you are diagnosing in your stall. It will be necessary to road test vehicle to get the block learn numbers to follow the integrator.