**please help** trouble with idle and voltage
#49
CF Veteran
Joined: Jun 2011
Posts: 2,858
Likes: 0
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Ok let's back up... A lot of people put new crank position sensors in and they still don't work. You really need to test the voltage. Disconnect the connector and probe it. Have someone crank the engines. You should have very close to .5 volts AC.
#50
Thread Starter
Seasoned Member
Joined: Oct 2011
Posts: 348
Likes: 0
From: Chicago
Year: 1989
Model: Cherokee
Engine: 4.0
I was on the gas when it almost died. Luckily right I front my house. And also what connector? I will be going to bed soon thanks to being have to be up at 1am for work. Yyaayy!!! :-/
#51
CF Veteran
Joined: Jun 2011
Posts: 2,858
Likes: 0
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
OOOH... the ckp sensor connector. Back of the engine it connects to the crank position sensor. Unplugging it and probe the side connected to the sensor.
#52
Thread Starter
Seasoned Member
Joined: Oct 2011
Posts: 348
Likes: 0
From: Chicago
Year: 1989
Model: Cherokee
Engine: 4.0
I tires to look up the ckp sensor and couldn't find any info on it. I think I know what you're talking about but not fully. When I get off work today I'm going to look more into it. Also I'm going to try and rent a code reader so I can test my ECM to see what it says.
#53
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 31
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
on renix a multi meter is the only way to figure out if any sensors are causing this should be sensor testing info herehttp://www.eriejeeppeople.com/Jeep_t...ion_manual.pdf
#55
Thread Starter
Seasoned Member
Joined: Oct 2011
Posts: 348
Likes: 0
From: Chicago
Year: 1989
Model: Cherokee
Engine: 4.0
Oh no the lights did come on. Its hard to see in the video but hey do turn on. Everything works on my dash so I'm guessing the ECM is fine right? I wish I knew someone who had a code reader so I can test my ecm to see what's goin on.
#56
CF Veteran
Joined: Jun 2011
Posts: 2,858
Likes: 0
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Can't test these things like that. Here http://www.lunghd.com/Tech_Articles/...iagnostics.htm also just www.lunghd.com has great info.
#60
CF Veteran
Joined: Jun 2011
Posts: 2,858
Likes: 0
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
CRUISER!!!! WHERE ARE YOU!! lol. You have to oversize the holes like one drill size. I've never done it so Ask cruiser54 for the specifics..... Tell him I sent ya Hahaha. Just watched that video. 9 times outta ten this issue will be the crank position sensor....or fuel pump. Did you check your fuel pressure?
Last edited by Slick761; 12-04-2011 at 09:39 AM.