Question about 1998 Lexus LX470
Occasional starting problems, car wants to turn over but appears not to be getting enough fuel. Took to a mechanic and could not do a diagnostic scan because no fuel pressure. After battery is unplugged and computer resets it starts right up. Check engine light non existent untill it want start. Mechanic states it checks out good after computer resets. Seems to happen more often in high humidity, may be just a coincidence. Happens multiple times on the SC coast, happens occasionaly when it rains inland. Please help with any suggestions, much appreciated!
Maybe the engine coolant temperature sensor dont work properly , sometimes do not the check light come on
Posted on May 08, 2017
chances are you don't have to replace the computer. the reason i tell you this is because you did not mention that the car is running lousy. no complaints of rough idle or missfire or hard starting. chances are that your engine speed sensor which sends the signal to the computer which then controls the transmission is most likely the culprit.. and it could just bhe that there is a loose connection between the two. if that is ok then your transmission control module is faulty. this is not the main computer, but the gobetween the trans and the ecm.. hope this helps please rate this...thanks(btw....the knock sensors control timing not the trans mission)
Posted on Sep 03, 2008
SOURCE: Car won't start
k is there power to fuel pump? yes,,, check grounds..... NO check relay only get kia relays for main and fuelpump since o2s run on the same relay,..... if relay is good suspect comp.... mine has same problem with no power to fuel pump i have now traced problem to ecu sux but at least it has a new fuel pump and relay lol.....
Posted on Mar 02, 2009
It seems that you have a loose wire, bad connector or perhaps the main computer itself that is causing a problem If the shop is not seeing any codes, or codes come and go, likely I'm right...but someone is going to have to actually do some intensive testing to find the real cause. You can likely get another computer from a local scrapyard far cheaper than what the dealer will charge you...as far as wiring, you need a good accurate schematic a good volt/ohmeter and lots of time to trace wiring. When checking connectors test the pin, then probe the wire going into the pin...often the problem is where a wire meets the backside of the pin, either corroding or breaking..This also applies to any modules such as the security system...what you see on the dash does not always tell you that connection to components is good. This is not a "fix, but rather, a direction to go in. (exactly what I"d need to do if I was there)
Right now, everything is suspect including fuel system, till you rule it out!!!
Posted on Jun 05, 2009
It does sound like an electrical issue. Double check if the ground connections are all OK. You may have to check out the wirings, even the wiring loom if all wires are still OK.
Posted on Jun 06, 2009
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