|01-12-2012 07:49 PM|
|BigGreen98||Ok changed crankshaft position sensor and I'm good to go|
|01-11-2012 07:18 PM|
|BigGreen98||So I just pissed that money away! New comp in and still no start|
|01-08-2012 08:35 AM|
|BigGreen98||Ok so the scan tool he had couldn't even find the computer. So I ordered one off e bay for 250, do I guess I'll just sit and wait with my fingers crossed|
|01-07-2012 08:29 PM|
|01-07-2012 10:37 AM|
PLEASE post what the mechanic says! I am still searching for Gremlins under my TJ.....
Damn things are hard to find.
|01-07-2012 08:58 AM|
|muherd50||Just last night got mine running right again. Wouldn't start....discovered it would run great after a shot of starting fluid to get it going. Posted on here and it was suggested to clean the TB...more specifically the IAC. That was my problem. Tried cleaning it while it was still on by spraying TB cleaner in the slot for the IAC and it was better but didn't fix it. I took the TB off and apart to clean it thoroughly and wow what a difference. It runs better than it ever. Love the WF!|
|01-07-2012 08:48 AM|
|01-07-2012 07:46 AM|
|BigGreen98||Thanks for all the help. I'm going back up there with a mechanic and diagnostic computer and wiring schematic and I'm not leaving till its fixed....... I hope lol|
|01-07-2012 03:01 AM|
guys there could be two jeeps here with the same, or similiar, problem.
my 100+ thread has many ideas.....still not wprking but feel ivam near solution....
i believe my prob is goijng to be ground related.....just not sure where the groind is
|01-07-2012 02:48 AM|
|sppacnivek||Ok, remember how I told you to bypass your fuel pump relay? You can bypass your ASD relay the exact same way. The CPS(crankshaft position sensor) is less than $20, so I'd replace that if she don't start by bypassing ASD relay. If after doing those two tests she still refuses to start, I'd have someone with a diagnostic computer to check the PCM. If she's getting fuel and air, the only thing left is spark. The way Chrysler made the plug wire system makes it very difficult to check for spark. I guess one could run a bare wire from the plug boot to a timing light to check for spark. There are three things that an internal combustion engine require: correct fuel/air mixture, and correct timing of the spark. Get those three things right and she should run. The cam position sensor could be the culprit if there is no spark. Hope this helps.|
|01-06-2012 03:42 PM|
|BigGreen98||I just didn't know which slot to put power on to bypas it|
|01-06-2012 02:10 PM|
|01-06-2012 01:08 PM|
|BigGreen98||Ok but how do I bypass the asd relay. I feel like such a tard right now because I work on cars all the time but I'm chasing my tail on such a small problem|
|01-02-2012 02:35 PM|
|01-02-2012 11:35 AM|
This is an exert from my Jeep manual: OPERATION - PCM OUTPUT
The ASD relay supplies battery voltage (12+ volts)
to the fuel injectors and ignition coil(s). With certain
emissions packages it also supplies 12–volts to the
oxygen sensor heating elements.
The ground circuit for the coil within the ASD
relay is controlled by the Powertrain Control Module
(PCM). The PCM operates the ASD relay by switching
its ground circuit on and off.
The ASD relay will be shut–down, meaning the
12–volt power supply to the ASD relay will be de-activated
by the PCM if:
˛ the ignition key is left in the ON position. This
is if the engine has not been running for approximately
˛ there is a crankshaft position sensor signal to
the PCM that is lower than pre-determined values.
This is why Ithink if you bypass ADS relay and it starts, it would be the CPS( crankshaft position sensor). If it don't start, have the PCM checked. Just saying what I would do.
|12-31-2011 06:52 PM|
|Jerry Bransford||Without input from the CPS, the PCM won't let the engine start period.|
|12-31-2011 06:33 PM|
|BigGreen98||Yea I swapped around all the relays and all are fine. I was under the assumption that the cam and crank sensors only controll timing of fuel and spark..... Which makes me think computer, but I don't wanna piss away 200 bucks on the computer and that not be the problem|
|12-31-2011 11:04 AM|
At the least, you can swap the fuel pump relay with another relay like the horn relay to verifiy you don't just have a bad fuel pump relay. There are probably 3-4 relays inside the PDC that are the same that can be swapped around for troubleshooting purposes.
|12-31-2011 02:42 AM|
|sppacnivek||Try bypassing the asd (auto shut down) relay and see if it starts. If it does, there are several possibilities. I would have to check the manual to advise on what activates the ASD. If it dont start, the ecm would be my next guess. Hope this helps.|
|12-30-2011 12:00 PM|
|BigGreen98||I bypassed the relay and the pump works. What does this mean|
|12-27-2011 09:40 PM|
|BigGreen98||No codes... Thanks for the input..... I will give that a shot|
|12-24-2011 11:41 AM|
|sppacnivek||Well Big Green, I'd start by swapping the fuel pump relay with a known good relay, say the horn or hvac relay(make sure the horn or a/c works). Or test your relay, BACKINBLACK's Grand Prix electrical modificationsRelays.htm. To check fuel pump, disconnect fuel line at rail,(position in safe direction) jump a 12+ wire (preferably with a momentary push button in line) from the battery to fuel pump relay slot 87 located in the fuse box(power distribution center) on fender under hood.. This should bypass everything to send voltage to pump. If pump does not pump gas, it's the culprit. If it works I'd check the ASD(auto shutdown) relay. Any codes? I hope this helps.|
|12-23-2011 08:03 AM|
|BigGreen98||Mine did the same thing but my pump won't cycle in at all. My fuses are good but there isn't power getting to the pump.... Suggestions?|
|12-13-2011 12:23 AM|
|sppacnivek||Well. Turns out the fuel pump quit pumping even though the pump motor did not fail. New fuel pump and all seems well. Thanks for the suggestions. Hope this thread helps someone else.|
|12-10-2011 01:51 PM|
mine would turn over good but nothing-did get a CEL though.
|12-10-2011 01:25 PM|
|Jerry Bransford||That the fuel pump cycles on for its normal 3 seconds when you turn the ignition switch on leads me to believe it's not the fuel pump. That you have replaced your crankshaft position sensor without it helping leads me to suspect the camshaft position sensor, on the passenger side of the engine block, on top of the shaft that used to hold the distributor.|
|12-10-2011 01:11 PM|
|sppacnivek||Well, no fuel to injectors leads me to replace the fuel pump this fine Sat. Just never had an electric pump quit pumping all at once while not running.|
|12-08-2011 09:31 AM|
|sppacnivek||I replaced CPS last night, still no start. Removed neg battery cable, replaced this morning, still no start. I poured some gas into air intake, she started right up. I just don't know if the injectors are working or the gas was entering the intake valves. I do know the ignition system is not at fault. I don't have the adapter nor the special tool to remove fuel line, as of yet. Does Jeep have a security system like GM. Had an S10 ignition security switch do this to me. Same symptoms.|
|12-08-2011 08:33 AM|
|yoopone||Been through this before. I would definitly replace the crank sensor. Cheap enough part and not too hard to get too. Went to the Hardware store, all was well, turned the Jeep off, came back out and no start. Same symptoms.|
|12-08-2011 08:25 AM|
|sppacnivek||Not that easy, 05 has some kind of a coil pack rail. No plug wires, looks like boots are an integral part of rail. Remove one, remove all.|
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