Guest 93.supra.turbo Posted June 16, 2012 Share Posted June 16, 2012 don't understand what is going on here, I was driving and went to give it some gas in 2nd gear and @ about 5500 rpm when I gave it about 75% throttle I hear loud pop sound like a backfire and the rpm gauge went all funny bouncing between 300 rpm and 1100 for about 3/4 seconds then died I rolled into a parking lot luckily. so I tried to start it up once I came to a stop all I got was it trying to turn over but would not fire up, so I have checked compression 170 across all 6. I changed spark plugs, I changed coilpacks to the superspark, I check all greddy ic piping and ic its self all is intake and good order, I check fuel pump it is running, I checked all fuse all are well and working, cams move when trying to turn engine over, I also have the bcc installed dont know if that is making it act the way it is but I uninstalled it aswell and wont start too soo moving on car is 93 jdm, I don't know what else to try I ordered a new fuel filter for it aswell I havnt ran it for codes yet maybe that is my next step... but if any one can help out that be awesome. current mods: hks supper dragger cat back, apexi intake, greddy fmic kit, walbro 255 lph fuel pump, superspeed boost cut controller, dunno if any of this will have contributing factor or not. thanks - A.Silva ill post video up later of what it going on. Quote Link to comment Share on other sites More sharing options...
absz Posted June 16, 2012 Share Posted June 16, 2012 Sounds like crankshaft sensor Or the star-ring which is pressed on the crankshaft gear which is for crank sensor signal Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 16, 2012 Share Posted June 16, 2012 I just put obd reader and one code came up. DTC:12 toyota engine speed (RPM) sensor circut. Quote Link to comment Share on other sites More sharing options...
absz Posted June 16, 2012 Share Posted June 16, 2012 Engine speed signal comes from the crankshaft sensor you need to check that with a multimeter Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 17, 2012 Share Posted June 17, 2012 Where is the crankshaft sensor located? Under the intake manifold? Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 18, 2012 Share Posted June 18, 2012 Sooo, I tested crank shaft sensor and cam shaft sensor both are working I noticed there was a scratch mark on crank shaft sensor on the tip, dunno if ne one else has ne more advice? Thanks A.Silva Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 18, 2012 Share Posted June 18, 2012 Sooo, I tested crank shaft sensor and cam shaft sensor both are working I noticed there was a scratch mark on crank shaft sensor on the tip, dunno if ne one else has ne more advice? Thanks A.Silva Quote Link to comment Share on other sites More sharing options...
absz Posted June 18, 2012 Share Posted June 18, 2012 There are two cam sensors fitted under the intake manifold but if one has gone faulty then the engine will still start. The crankshaft sensor is located at the crankshaft pully end. under the alternator there is a connection plug for the crank sensor is that the one you have checked? if so how did you check this Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 18, 2012 Share Posted June 18, 2012 Tested signal from sensor still installed.. Voltage alternating= 0.336v max. Resistance of sensor=1300ohms Quote Link to comment Share on other sites More sharing options...
absz Posted June 18, 2012 Share Posted June 18, 2012 With a good battery you should be getting approx 1-2 volts AC cranking 0.3 seems a bit low to me. if the crank signal is being recieved by the ecu then while you are cranking you should see the rev counter needle moving (bouncing) very slighty. Did you check for a spark at the plugs when the coilpacks were changed Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 19, 2012 Share Posted June 19, 2012 I don't think the rpm needle move at all, I took a video im going to post it on youtube shortly here, I havnt checked for spark with new coils, doing that today Quote Link to comment Share on other sites More sharing options...
skyline1 Posted June 19, 2012 Share Posted June 19, 2012 Not something as silly as blown a boost pipe off is it? it once happened to my skyline when i blown a intercooler pipe off, backfired, lit the road up with flames and died, wouldnt start, idle or even attempt to run. Just my opinion.....sorry if im way off . Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 19, 2012 Share Posted June 19, 2012 http://www.youtube.com/watch?v=l2FcRLswC1k&feature=youtu.be Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 19, 2012 Share Posted June 19, 2012 Not something as silly as blown a boost pipe off is it? it once happened to my skyline when i blown a intercooler pipe off, backfired, lit the road up with flames and died, wouldnt start, idle or even attempt to run. Just my opinion.....sorry if im way off . I have all my ic piping off at the moment to get cleaned and re power coated, but I checked befor hand and all was good. when I reinstall the ic piping ill take a look at the hoses on top of engine. thanks Quote Link to comment Share on other sites More sharing options...
skyline1 Posted June 19, 2012 Share Posted June 19, 2012 Always worth a check mate even though im probably wrong . Quote Link to comment Share on other sites More sharing options...
absz Posted June 19, 2012 Share Posted June 19, 2012 Error code 12 and no signal to the rpm needle, you need to have another look at the crankshaft sensor it MIGHT not be the sensor itself but the pickup signal ring gear as i have mentioned before. Quote Link to comment Share on other sites More sharing options...
absz Posted June 19, 2012 Share Posted June 19, 2012 (edited) Always worth a check mate even though im probably wrong . The piping will not prevent the engine from starting EDIT the skyline engine has a airflow meter so you will be correct in that case:) but the supra has a map sensor unless its a uk spec. Edited June 19, 2012 by absz (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 19, 2012 Share Posted June 19, 2012 is there a easy way to get a look at the ring gear? Quote Link to comment Share on other sites More sharing options...
absz Posted June 19, 2012 Share Posted June 19, 2012 you can remove the crankshaft sensor a poke your little finger in there to see if you can feel anything loose:D Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 19, 2012 Share Posted June 19, 2012 you can remove the crankshaft sensor a poke your little finger in there to see if you can feel anything loose:D k ill give it a go Quote Link to comment Share on other sites More sharing options...
absz Posted June 19, 2012 Share Posted June 19, 2012 here is a link to a similar problem to yours http://www.mkivsupra.net/vbb/showthread.php?261842-please-help-loud-bang-now-car-won-t-start/page5&highlight=ring+gear Quote Link to comment Share on other sites More sharing options...
Guest 93.supra.turbo Posted June 19, 2012 Share Posted June 19, 2012 found problem guys http://www.supraforums.com/forum/showthread.php?463121-If-you-have-Crank-but-no-start-symptoms-..... Quote Link to comment Share on other sites More sharing options...
absz Posted June 20, 2012 Share Posted June 20, 2012 Told you this on my first post:d Quote Link to comment Share on other sites More sharing options...
Garf88 Posted January 4, 2014 Share Posted January 4, 2014 Sounds like crankshaft sensor Or the star-ring which is pressed on the crankshaft gear which is for crank sensor signal Guys.. Could the crankshaft sensor or star ring cause the following. Upon ignition I get no engine management light and the slip control flashes. It will turn over but not start. When I bridge the diagnostic port I get a regular and constant flashing from the engine management light which as far as I have read, means no fault. Any clues would be massively helpful. Mind boggling as to why the engine management light does not come on with ignition like it should do. Quote Link to comment Share on other sites More sharing options...
absz Posted January 5, 2014 Share Posted January 5, 2014 Guys.. Could the crankshaft sensor or star ring cause the following. Upon ignition I get no engine management light and the slip control flashes. It will turn over but not start. When I bridge the diagnostic port I get a regular and constant flashing from the engine management light which as far as I have read, means no fault. Any clues would be massively helpful. Mind boggling as to why the engine management light does not come on with ignition like it should do. No engine light will most proberly be a power feed fault ie ignition fuse in drivers footwell or maybe feed from alarm system Quote Link to comment Share on other sites More sharing options...
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