Auto Repairing Hard Start in Hot Weather: Accord and Civic
On '90-93 Accords and '88-91 Civics, if your customer complains that in hot the weather the search engine is intermittently of hard to startor it will not start at all, measure the fuel pump voltage when the search engine does not start. If the fuel pump voltage reads 0 volts when the search engine is cranking or 0 volts for 2 seconds when the ignition switch is turned ON (II), replace the main relay. On '88-91 Civics, the MIL may also come on with a DTC 16. If you can not measure the fuel pump voltage Because you can not duplicate a hard-to-start or no-start condition, consider this scenario in your diagnosis of:
Your customer tries to start the engine after the vehicle’s been sitting in the sun for several hours; it cranks, but it won’t start. Your customer cools the interior of the vehicle a few degrees by lowering a window or opening the door, now the engine cranks and starts normally. If the complaint matches this scenario, remove the main relay, and use an 8X magnifier to look at the two solder joints on the relay’s printed circuit board. If the solder is cracked, replace the main relay.
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