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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / June 2006Fuel Pump Delay
On my 93 Jeep Cherokee 4.0L, there is a delay of about 40 seconds from turning on the ignition switch to the fuel pump relay closing and activating the pump and charging the injector rail to 40 psi. This delay is present only when the ignition has been off for several hours. If the vehicle was recently driven, there is no delay from ignition switch on to the fuel pump relay closing and activating the fuel pump. There are no trouble codes. My first move would be to see if the relay's coil was being denied power for the 40 seconds. You need to investigate that. The only other possibilities I could think of would be that the relay or fuel pump are somehow binding/sticking... and it takes the 40 seconds to come to life. www.telstar-electronics.com In article <1149622951.939020.321840@u72g2000cwu.googlegroups.com>, > On my 93 Jeep Cherokee 4.0L, there is a delay of about 40 seconds from > turning on the ignition switch to the fuel pump relay closing and [quoted text clipped - 5 lines] > > There are no trouble codes. You need to diagnose whether this is an electrical delay or a fluid pressurizing delay. Sounds like the fuel lines are draining down after an extended sit. Try turning the key on for ten seconds, off for ten seconds, on for ten seconds off for ten seconds to pressurize everything, if the engine starts quicker, you know it the fuel draining back. Problem Solved Replaced the Powertrain Control Module (PCM) $175.00 Advanced Auto $75.00 Core Limited Lifetime Warranty The delay in the check engine light operating when the ignition switch was turned on was the most significant symptom. The check engine light comes on after the PCM completes an initial internal self test which is very short. If the check engine light is not on, either the lamp is bad or the PCM is not operational. Without the PCM, the fuel pump relay will not operated since it is directly controlled by the PCM. The delay in the check engine light and the delay in the fuel pump running were the same. > In article > <1149622951.939020.321840@u72g2000cwu.googlegroups.com>, [quoted text clipped - 16 lines] > for ten seconds off for ten seconds to pressurize everything, if > the engine starts quicker, you know it the fuel draining back. In article <1149772831.000995.223530@j55g2000cwa.googlegroups.com>, > Problem Solved > [quoted text clipped - 12 lines] > The delay in the check engine light and the delay in the fuel pump > running were the same. The delay in the check engine light coming on was not mentioned in the original post. |
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