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Jeep Wrangler YJ
YJ General Discussion
Hard start problem when engine is cold
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<blockquote data-quote="Flyer58" data-source="post: 428179" data-attributes="member: 18629"><p>You may want to start by checking the fuel pressure at the fuel rail by the injectors. When you shut down the engine the pressure should hold for quite a while, mine dropped only 1 PSI over an hour. If there's a bad check valve in the fuel pump or possible the pressure regulator is bad the fuel may drain back to the tank. When you first turn on the key to the run position you should hear the fuel pump come on for a few seconds to prime the fuel line. That may or may not be enough to quickly start the engine.</p><p></p><p>You should be able to borrow a fuel pressure test kit free from a local auto parts store like AutoZone.</p><p></p><p>Specs for the fuel pressure and other good info can be found in the Factory Service manuals located in this forum in the resources section. <a href="https://wrangleryjforum.com/forums/yj-resources.121/" target="_blank">YJ Resources | Jeep Wrangler YJ Forum</a></p><p></p><p>Cheers. Let us know.</p></blockquote><p></p>
[QUOTE="Flyer58, post: 428179, member: 18629"] You may want to start by checking the fuel pressure at the fuel rail by the injectors. When you shut down the engine the pressure should hold for quite a while, mine dropped only 1 PSI over an hour. If there's a bad check valve in the fuel pump or possible the pressure regulator is bad the fuel may drain back to the tank. When you first turn on the key to the run position you should hear the fuel pump come on for a few seconds to prime the fuel line. That may or may not be enough to quickly start the engine. You should be able to borrow a fuel pressure test kit free from a local auto parts store like AutoZone. Specs for the fuel pressure and other good info can be found in the Factory Service manuals located in this forum in the resources section. [URL='https://wrangleryjforum.com/forums/yj-resources.121/']YJ Resources | Jeep Wrangler YJ Forum[/URL] Cheers. Let us know. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Hard start problem when engine is cold
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