Question about 1987 Jeep Cherokee

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1987 jeep cherokee 4.0 Starting Issue engine cranks over but won't start- will start and run if primed. Will restart ok but if left setting will not start again. Changed: Fuel Pump Fuel Pump solenoid checked; TPS Crank Sensor it has fuel at the injectors fule pump runs for a few seconds at turn on. then stops . then restarts at cranking- as it is supposed to do. it appears the ECM is not telling the injectors to fire. Checked wireing diagram and i don't see anything that could cause provlem.

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Check your temp sensor. if it's out of range it could be sending incorrect readings to the computer. Also check the white ceramic block on the drivers side fender back near the brake cylinder. It is a resistor that affects pump pressure on start up.

Posted on Mar 23, 2011

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2 Answers

My 1995 grand cherokee takes a lot to start. turns over fine, but won't fire. checked fuel rail, no pressure. after trying 15 times or so, it will start and run just fine. starts right back up unl


Your Jeep has what's known as the delayed start, no check engine light problem. The Jeep will not start until the check engine light comes on, on the dashboard. Next time it cranks but will not start, look at the dashboard to see if the check engine light is illuminated. If it's not lit up, then your Jeep does have that problem and your Jeep ecu is in need of repair or replacement. There are components inside the ecu that are going bad and will continue to get worse, eventually leading to a permanent no start condition. There are ecu repair services and replacement ecus on ebay.

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1 Answer

Have to turn the ignition on and off several times to get the fuel pump working


Your Jeep ecu is in need of repair. Your jeep is having a common problem known as the "Delayed check engine light" starting problem. Next time you try starting the jeep and it the fuel pump won't prime, look at the dash.....the check engine light is not on and the fuel pump will not come on until the check engine light eventually come on, on the dash. Have it repaired and it will eliminate the delayed check engine light start problem.

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fuel pump relay . you should hear the fuel pump run for 5 seconds as soon as you turn the key on .after that the cranking sensor takes over when engine it turned over to start

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The 1987-90 Jeep Cherokee with the Renix Eletronic Engine controls take somewhere between 4-7 revolutions before the computer has enough information to get the engine started.

If it takes longe rthan that, it may be time for a full tune-up:
Distibutor Cap and rotor
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Spark Plug wires
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1 Answer

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