Hard start
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Joined: Feb 2018
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Model: Cherokee(SJ)
Hard start
Having issue with starting my 2000 xj, it takes about 2 or 3 tries to get it first started, after it starts it runs perfectly fine will even start right back up with no issue it’s really only the first start of day that’s is a issue, i was thinking injectors, they do look like they would be the originals. Any advise would help thanks.
CF Veteran
Joined: Dec 2015
Posts: 2,139
Likes: 93
From: Syracuse, NY
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0L
Things that would be more likely than injectors:
1. Fuel pump that does better after it warms up.
2. Air building in the fuel rail when vehicle is cooling down
3. Idle Air Control that is working better after getting warmed up
4. Weak battery and/or too heavy oil (10w-30) being used in cold temperatures causing the engine rpms to not be high enough during start. Subsequent starts being much faster. PCM won't initiate ignition until it sees appropriate RPM during startup cranking phase.
Injectors -tend- to not fail all at once. They also -tend- to cause misfires and poor running more than failed crank-no-start. They can all fail to perform at once due to things like an ASD relay failure, or ignition switch failure (but the injectors themselves are not failing, just not being commanded). But since you say its running once you get it started, those are probably not the issue.
1. Fuel pump that does better after it warms up.
2. Air building in the fuel rail when vehicle is cooling down
3. Idle Air Control that is working better after getting warmed up
4. Weak battery and/or too heavy oil (10w-30) being used in cold temperatures causing the engine rpms to not be high enough during start. Subsequent starts being much faster. PCM won't initiate ignition until it sees appropriate RPM during startup cranking phase.
Injectors -tend- to not fail all at once. They also -tend- to cause misfires and poor running more than failed crank-no-start. They can all fail to perform at once due to things like an ASD relay failure, or ignition switch failure (but the injectors themselves are not failing, just not being commanded). But since you say its running once you get it started, those are probably not the issue.
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