90jeepfullofmud
NAXJA Forum User
- Location
- southwick mass
i have a 1990 jeep i was driving than it just died and would not start towed it home it start today if you give it gas it some time pops and other time just dies and no it was no spark
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need help
- Thread starter 90jeepfullofmud
- Start date
lawsoncl
NAXJA Forum User
- Location
- North Idaho
No spark is usually the Crankshaft Position sensor. It's usually (incorrectly) called the CPS sensor.
90jeepfullofmud
NAXJA Forum User
- Location
- southwick mass
if you onplug the vac line going to the MAP Sensor it will run if you give it gas it dies
Last edited:
- Location
- MilkyWay Galaxy
You need to shorten your sentences, or add punctuation, to your runnnnnnon sentences so we can understand what your actually saying.
Does it have spark or not?
Does it have spark or not?
- Location
- MilkyWay Galaxy
90jeepfullofmud
NAXJA Forum User
- Location
- southwick mass
if you un plug the vac line to the map Sensor it will run. if you give it gas it will die
- Location
- MilkyWay Galaxy
OK, that last part is actually normally. Are you saying it will not run, idle, start, with the vac line connected to the MAP sensor?
And that answers the other question, it runs so it has spark and fuel.
90jeepfullofmud
NAXJA Forum User
- Location
- southwick mass
it will run with the map unplug it has fuel and spark
Last edited:
theNAST1EST
NAXJA Forum User
- Location
- 40°07'02.99" N, 76°28'52.99' W
bmfm64
NAXJA Forum User
- Location
- covington wa
search for crankshaft position sensor and you should find a step by step way to tell you how to fix it or at least diagnose what's going on better.
- Location
- MilkyWay Galaxy
Why do think it is the CPS? He has just said it runs with the map unplugged?
Sounds like the MAP sensor may be bad, but they rarely go bad.
What happens if you start it with the MAP unplugged, then reconnect the MAP?
lawsoncl
NAXJA Forum User
- Location
- North Idaho
You sure it's not a bad coil or spark wires? In this thread you mentioned a previous problem with spark wires. http://www.naxja.org/forum/showthread.php?t=1002907
90jeepfullofmud
NAXJA Forum User
- Location
- southwick mass
if you reconnect the MAP it dies. i just put new spark wires.
Original_MudButt
NAXJA Forum User
- Location
- In the eighth dimension
I have never heard of spark wires.
90jeepfullofmud
NAXJA Forum User
- Location
- southwick mass
it has new Spark Plug wires
lawsoncl
NAXJA Forum User
- Location
- North Idaho
Are you unhooking the vacumn line to the MAP or the electrical connector? I think you need to verify that the fuel pressure is good. Some stores like Autozone will loan you a fuel pressure guage.
- Location
- MilkyWay Galaxy
In that case I would change the MAP sensor.
90jeepfullofmud
NAXJA Forum User
- Location
- southwick mass
it has a new fuel pump and fuel filter i am unplugging the vacumn line to the MAP
- Location
- MilkyWay Galaxy
Then the MAP sensor must be bad. Which is rare, but does happen.
Check that it is an OEM MAP, and some custom adjustable MAP.
90jeepfullofmud
NAXJA Forum User
- Location
- southwick mass
i just put i new map sensor and it will start as soon as you give it gas it will die
