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Jeep Wrangler YJ
YJ General Discussion
Suddenly hard to start when cold
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<blockquote data-quote="Flyer58" data-source="post: 426069" data-attributes="member: 18629"><p>I hope someone here can help with new injectors because I spent days researching for four new ones for my 2.5L and never found a good answer.</p><p></p><p>The key issue is finding a matching flow rate for the fuel rail pressure. Some argue don't worry because the computer will detect any changes and make adjustments while others say the computer is slow and not always right so initial performance will be ok/better but MPG's suffer and the computer wears out faster. This all sounds plausible but I can't find anything to back it up.</p><p></p><p>Identical replacements are hard to find and much more expensive than somewhat matching ones on the market. Bosch and others have several sets with four spray nozzles instead of the OEM with one but then we get into that issue with fuel flow and the conversations keep going in circles about which is better.</p><p></p><p>Testing:</p><p></p><p>Before you go any further you can do a simple test of the electric coil inside each injector with an ohm meter and that may isolate one or all injectors as not working properly.</p><p></p><p>Simply check the ohm resistance by probing the two pins on the injector. The YJ factory spec calls for 14.5 ohms +- 1.2 ohms. Easy, you only remove the connector and keep the injector in place. </p><p></p><p>Mine all checked within specs when I rebuilt the engine so I just cleaned them reused them.</p></blockquote><p></p>
[QUOTE="Flyer58, post: 426069, member: 18629"] I hope someone here can help with new injectors because I spent days researching for four new ones for my 2.5L and never found a good answer. The key issue is finding a matching flow rate for the fuel rail pressure. Some argue don't worry because the computer will detect any changes and make adjustments while others say the computer is slow and not always right so initial performance will be ok/better but MPG's suffer and the computer wears out faster. This all sounds plausible but I can't find anything to back it up. Identical replacements are hard to find and much more expensive than somewhat matching ones on the market. Bosch and others have several sets with four spray nozzles instead of the OEM with one but then we get into that issue with fuel flow and the conversations keep going in circles about which is better. Testing: Before you go any further you can do a simple test of the electric coil inside each injector with an ohm meter and that may isolate one or all injectors as not working properly. Simply check the ohm resistance by probing the two pins on the injector. The YJ factory spec calls for 14.5 ohms +- 1.2 ohms. Easy, you only remove the connector and keep the injector in place. Mine all checked within specs when I rebuilt the engine so I just cleaned them reused them. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Suddenly hard to start when cold
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