wont start

poomero · Oct 27, 2009

1990 jeep 4.0

the jeep has been sitting for only a week and it wont fire up.

i changed all the plugs, wires, cap and rotor about 4 months ago. the jeep has been running fine but i went out to start it and no it wont run. it will turn over but it wont fire at all. i took the cap off and it was dry. any ideas?

joe_peters · Oct 27, 2009

Check the static voltage between the battery terminals--s/b about 12.5 volts; then check the voltage between the terminals when cranking and post back the results.

poomero · Oct 28, 2009

dont have a volt meter. i just moved and dont have anything. i need an easy fix.

theNAST1EST · Oct 28, 2009

...see if you're getting fuel into the cylinders.

An easy way is to turn the engine over a few times, then yank a plug to see if it's wet (with gas).

poomero · Oct 28, 2009

sounds like a good idea. i will do that tomorrow.

lil_red_wagon · Oct 28, 2009

also once mine wouldnt start on the trails it turned out to be fuel system shut down removed neg cable and let it reset started back up. also could be you cps (crank position sensor) if it goes it will not start for crap had that prob too.

joe_peters · Oct 28, 2009

Modern Automotive LIfe (MAL--I just made that up) begins with the battery.

The starting system of most vehicles is (are?) ignorant--it will perform adequately with low voltage as long as the amps are there. However, the modern electronics will usualy fail to function when supply VOLTAGE drops to less than 9 v. Plenty of amps to crank, but it won't start.

Quick fix? Replace everything and hope it starts.

lil_red_wagon · Oct 28, 2009

i have had the batt issue once before used a diff batt started right up. wouldnt even jump off

wont start

poomero

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