Prius No Start
Hello to all in DN. This is my first post here. I joined in 2018, but I never paid the subscription, not because of cost, but because I really didn’t know if I had time for another forum. I have been active in..... that other forum for over 20 years. With recent events being what they are, it may be time to migrate over to DN.
That being said, I would like some opinions on how I should proceed with this Prius. It was towed to me from a transmission shop. They installed a Toyota remanufactured transmission. The owner called me and said it runs poorly and has no power, then shuts off, well.... it wasn’t running, he just didn’t know it cranked at 1000 RPM.
By the time I got there, I only had one cranking event left in the HV battery. I was able to determine RPM and MAF GPS on the scan tool. The battery cells were reading 10.5-13.0 volts... not good. I had it towed to my shop, the transmission shop sent me a new HV Battery. (Trans Star) which I was a little sketchy of. However it is fully charged and works. He said he drove it in before he replaced the transmission.
I have confirmed a good CKP, CMP, spark, injector pulse and COP output. I matched the CMP/CPK signal to a known good Corolla Engine. Everything seems to be in time. I have also tried alternate fuel while cranking. I have over 175 PSI compression. I have over 2% CO and about 6.5% CO2 in the exhaust pipe, pegged out HC. I think I am combusting some fuel based on the CO reading.
I have checked the oil level, cleaned the MAF, verified that all the hoses are connected under the air box. I followed all the harness and connectors to and from the transmission.
My question is, what should I do next? I have a limited amount of cranking events before the new HV battery is depleted! I need to make the most of each crank. I do not have an HV Charger.
I will post any screen shots or captures you feel are needed. I have Tech Stream, Pico, etc... I am just afraid of killing the battery.
Thanks for your time.
Hey, Jamey did by chance you check to see if the egr was stuck open, have seen it a number of times.Will cause a no start.
If I can believe the position PID in the Techstream, it is closed.
Scroll down and see my last post
I agree with Ron, check EGR. Now when you say "alternate fuel" do you mean sprayed some brake clean or other sort of combustible fluid in the intake while cranking?. My next step would be to verify that the exhaust is not plugged, check fuel pressure, engine coolant temperature. No codes? Was the transmission replaced for this problem? Or happened after? Make sure the 12 volt battery is in…
I agree with these guys, stuck egr or clogged catalytic convertor. Remove the upstream o2 sensor and see if it starts.
Hey Jamey, If the "new" HV battery is any good you should have dozens if not hundreds of crank attempts. The previous HV battery was probably damaged due to driving it and the ICE not kicking in. That being said your right to be weary of cranking it too many times and should try to perform multiple tests at once. If it does stop cranking you can perform a hard reset (touch the 12 volt battery…
No way is cat plugged. Never seen it on any gen Prius. Egr plugged? So what. It would still start. Try alt fuel through throttle. Engine timing is fine. Never an issue. Try and get more info on trans replacement. Very unusual for gen 3.
You have never seen a cat plugged on a Gen 3????? Causing a no start?????? Woww,I have seen it atleast 5 times.
Maybe just lucky? Wasn't sure how many question marks to use.
Thanks Matthew, I was a little paranoid about extensive cranking. I feel a bit better about it after reading your post. I still don’t want to over do it though. I am leaning towards a fuel quality issue. The shop is pretty busy right now. I’m limited on the amount of quality time I can spend on it. I report my next findings. Thanks for you advice.
Thanks for all the responses. I was stacked up today and couldn't spend much time on the Prius. I did remove the O2, it does start, doesn’t run well, but it definitely is running. The ECT is rising. Idle only and not very well. I don’t like the smell of the exhaust and I will take a fuel sample tomorrow. Stay tuned.
Sounds like your on the right track. I've had diesel contaminated vehicles melt catalytic converters before. I have a theory about the transmission replacement: The customer contaminated the fuel system (most likely diesel) and the vehicle started to misfire. When these cars start to misfire it develops a terrible noise from the transmission. When MG1 in the transmission starts acting as a…
I agree with you. When I was talking to the transmission shop owner before I had it towed over, his eyes kinda glazed over when I told him these transmission will clack and make noise when they run poorly or misfire. I doubt it needed a transmission, it only has 88k miles. But...... that’s not my deal!
Sure it isn't the dampener assembly bolted to rear of engine?
I don't know if anyone can be sure of either but that makes sense too
I connected my fuel injection canister to the fuel rail. I ran it on clean fuel. It still runs like poo, I have a back pressure gauge installed, it reads 0. Not like I can snap the throttle. There was some nasty looking rusty liquid in the intake below throttle plate, not sure what it is. I cleaned it out, but it still runs the same. Here is a picture. I will get back to my lap top and try…
Every Prius intake I've ever looked in has had oil or blown-by material in it, so I wouldn't chase that too much. I've seen these Gen-III's misfire at idle due to clogged EGR ports. Don't ask my why it misfires at idle considering there is no EGR activity but it does. I imagine it has something to do with turbulence or airflow. I would remove the intake and clean the ports the best you can. If…
I will pull the intake if needed, Anything to be gained by removing the EGR and starting the engine?? I am not the brightest bulb on the tree, but I can't seem to upload 2 screen shots from Techstream. I made jpg. pictures out of them, I have them in the drop box, but when I click upload, it says there is nothing selected?? I'm new here, its my first screen shot upload. I did the picture of the…
Ok..... now I feel stupid. I had checked the EGR early in this rodeo, I was commanded 0% and it reads 0%. Someone here asked me if it was open and I said “If I can believe the Techstream it’s closed! Well... I can’t believe the Techstream. I removed the 2 screws that hold the EGR solenoid to the body and the spring and plunger fell out. I tried to move the pintle and it was stuck in the down…
Nice. Dont you love that feeling?
Haha! Yeah, I would have liked it better last week! 😆
It's always a nice feeling to have one like this figured out. Way to stick with it!
Thanks for your help. I do appreciate the fact that no one here was trying to offer ammunition for a parts cannon! Just logical diagnostic steps until the answer reveals itself!