Hi Ive a 3.2 V6 Bighorn petrol from 1992 which is normally great to drive but its recently deteriorated to the point of no longer starting. It would run well for a while until warm and then slow down and throw up a CEL. However when id go to check the code by turning the engine off and ignition back on it would always of cleared and give the all good 1-2 flash. The engine would also be fine again so long as the car was turned off for a few seconds. I thought i could get away with this for a while but wishful thinking. It got worse with the idle fluctuating markedly. I checked the two sensors at the start of the inlet manifold, ie throttle position sensor and the Idle air control valve and both seemed to work normally. When i removed the TPS the CEL flashed that code and the IAC seemed to operate normally with voltage applied to it.
So i thought it may be dirty fuel as its sat for a while due to covid. I put in a fuel conditioner and not long after that it began not starting. I thought maybe i had loosened some gunk in the fuel system but on further investigation with an induction light i have no spark on any cylinders.
I checked the connector plug on the far right of the engine when looking at it to the coils and that had 12V and Neg when the ignition was put on. Ive noticed that the car is not showing any rpm when its cranking so im suspecting its the crankshaft position sensor, although im not on solid ground at all in my mechanical ability.
Ive being trying to find the Crankshaft position sensor but having no success. Can someone please let me know where to find it. I live in NZ where the drivers side is opposite from American models. Im trying to add a picture but cant seem to get it under 500kb
Thanks for giving it some thought
Isuzu 3.2 deteriorated to non starting
Re: Isuzu 3.2 deteriorated to non starting
A free program called Irfanview is great for resizing pictures although Im not sure what you can take a picture of
Re: Isuzu 3.2 deteriorated to non starting
geeves wrote:A free program called Irfanview is great for resizing pictures although Im not sure what you can take a picture of
Haha yes it was just a picture of the engine bay, ive always liked threads with a picture of some sort so thought id try and add one. Il try it again thanks
Haha yes it was just a picture of the engine bay, ive always liked threads with a picture of some sort so thought id try and add one. Il try it again thanks
Re: Isuzu 3.2 deteriorated to non starting
Engine picture
Re: Isuzu 3.2 deteriorated to non starting
I see a lot of vac hoses on that engine but really my money is on the ecu which isnt a good place to start. Can you get a code while cranking? May have to use a scanner
Re: Isuzu 3.2 deteriorated to non starting
geeves wrote:I see a lot of vac hoses on that engine but really my money is on the ecu which isnt a good place to start. Can you get a code while cranking? May have to use a scanner
Yes vac hoses sprout out everywhere and none are new too. Ive checked them all over and none are leaking.
Unfortunately i dont get any CEL code apart from the all clear 1-2 flash.
Ive found the Crankshaft position sensor, it definitely wasnt designed as priority for maintenance on it. Its on the drivers side (left side looking at the car from the front in NZ). Its under the exhaust manifold and by the engine mount and in front of the oil dipstick tube. To undo it was no joy. The tire came off and then i accessed it through the wheel well. i used a 10mm socket with a UJ on it as you cant get a straight run at it due to metal brake lines. If you have a thin walled 10mm spanner you might be able to fit it on and access it from under to the rear. To remove it i pried it off with a screwdriver and then ran the gauntlet by shoving my hand in the tiny gap to pull it out.
I had traced the wires from it earlier and had 12V and neg on them and i couldnt get anything on the signal wire, i think i should of being able to get a Vac signal but i might be wrong there. Im going to try and get one second hand or on ebay as they arent too bad $20 brand new on that compared to a shop.
Im not very certain here Geeves so will think about the ECU too thanks
Yes vac hoses sprout out everywhere and none are new too. Ive checked them all over and none are leaking.
Unfortunately i dont get any CEL code apart from the all clear 1-2 flash.
Ive found the Crankshaft position sensor, it definitely wasnt designed as priority for maintenance on it. Its on the drivers side (left side looking at the car from the front in NZ). Its under the exhaust manifold and by the engine mount and in front of the oil dipstick tube. To undo it was no joy. The tire came off and then i accessed it through the wheel well. i used a 10mm socket with a UJ on it as you cant get a straight run at it due to metal brake lines. If you have a thin walled 10mm spanner you might be able to fit it on and access it from under to the rear. To remove it i pried it off with a screwdriver and then ran the gauntlet by shoving my hand in the tiny gap to pull it out.
I had traced the wires from it earlier and had 12V and neg on them and i couldnt get anything on the signal wire, i think i should of being able to get a Vac signal but i might be wrong there. Im going to try and get one second hand or on ebay as they arent too bad $20 brand new on that compared to a shop.
Im not very certain here Geeves so will think about the ECU too thanks
Re: Isuzu 3.2 deteriorated to non starting
Ive Ohmn tested the two pins on the sensor and its open, that is apparently a fail. So im ordering one new from the US $32 including freight, due in two weeks, will update with results.
Re: Isuzu 3.2 deteriorated to non starting
geeves wrote:I see a lot of vac hoses on that engine but really my money is on the ecu which isnt a good place to start. Can you get a code while cranking? May have to use a scanner
Yes my money is on you being right Geeves, im just a shadetree slapper about with these Isuzus. I put the new crankshaft position sensor on and the rpm gauge goes up a bit now, to about 350rpm but im getting no spark at all, even when pulling out a sparkplug or so so she spins faster.
The ECU is that the ignition control module under the coils?
And what are the diodes in the fuseboxes? How do i check them? Ive never come across those before
Thanks
Yes my money is on you being right Geeves, im just a shadetree slapper about with these Isuzus. I put the new crankshaft position sensor on and the rpm gauge goes up a bit now, to about 350rpm but im getting no spark at all, even when pulling out a sparkplug or so so she spins faster.
The ECU is that the ignition control module under the coils?
And what are the diodes in the fuseboxes? How do i check them? Ive never come across those before
Thanks
Re: Isuzu 3.2 deteriorated to non starting
I tried this troubleshooter and it shows the 12 v and good ground to the computer thing under the coils and the CKP sensor test to it also seemed to pass so according to that im up for an ECU
https://easyautodiagnostics.com/isuzu/3 ... le-tests-1
https://easyautodiagnostics.com/isuzu/3 ... le-tests-1
Re: Isuzu 3.2 deteriorated to non starting
Im still awaiting the ECU (ignition computer module) from the US. I got it new for about $50NZ.
Im currently cleaning up the coils etc. Im just wondering are they meant to have clean grounds where the bolts go through that hold them to the base?
On my outboard the coils use these spots as grounds and im wondering if its the same here, if so il get into them with sandpaper, if not il leave this brittle area untouched
Im currently cleaning up the coils etc. Im just wondering are they meant to have clean grounds where the bolts go through that hold them to the base?
On my outboard the coils use these spots as grounds and im wondering if its the same here, if so il get into them with sandpaper, if not il leave this brittle area untouched