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Hello everyone, I recently swaped engines and now the engine light and hold light are driving me crazy. sometimes it s only engine light and when both are flashing it won't shift to 4th gear. before putting the engine on checked the belt and it looked as it was replaced with the tention pully. scan reads missfire code p0300. just had a tune up done.I don't feel like spending more money without knowing what the problem is.
PLEASE HELP.
Where did the replacement engine come from - rebuilt with a warranty, pulled from a wreck? How many miles on it, and did anyone do a compression test yet?Quote:
Originally Posted by ak1you
misfire code, have you checked the spark plug wiring sequence?
engine used had 51000 miles on it nobody did a compression test
If the engine runs good (smooth idle) then most likely your P0300 (random misfire) is due to the Crankshaft position sensor (to computer) needing a Crankshaft re-learn procedure. I just replaced my 2005 engine with a 2008 (50,000 km on it). The engine was noisy on start-up but then ran good except throwing code P-0300 which was corrected with CrankShaft re-learn procedure. Mine's a 5 spd manual so I didn't have the other code and shifting problem you have. I drove for three weeks with CEL on.
Unfortunately, in my case, GM didn't do "Crankshaft re-learn" properly another shop ended up getting it done for a fraction of the price ($40 vs $150). Currently trying to get refund from GM.
Make sure your using the crankshaft position sensor that was originally with old engine (located below oil filter). Or at least cross-reference part numbers (RockAuto online is good for this). The shop that did my "re-learn" used a Snap-On calibrator that emulated GM Tech II calibrator - call around as not all calibrators can do this.
The "Crankshaft Re-learn procedure" is in the GM shop manual and specifically mentions this is required with an engine replacement.
See attached link which I came across that applies more to your situation.... Car with Automatic Transmisssion.
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Goodluck
I went to the dealer and did the crankshaft learn procedure. the tech and I test drove the car after and same problem reaccured. Missfire code. but the scanner showed no missfires on any of the cylinders. and I also changed the crankshaft sensor. Please advise.
Make sure sensor (or at least part number matches) was one that was with car originally (sounds like you did this). Try some other shops to do re-learn as I tried four times before success (1 dealer and 3 independent shops). Bring the article (link) with you when you go to have it done. They seem to have to plug in their scanner to see if re-learn option is available. I believe the scanner that worked for me was a Snap-On unit but don't know exact model number.
Sounds like re-learn isssue if not showing a real missfire - crankshaft needing re-learn will show false missfire.
Goodluck
THe crankshaft learn procedure solved the problem with my 2005 auto :)
Hello everyone! I also have a 05 aveo that recently started flashing the engine and hold lights. I disconnected the battery and all was fine for a day. Now just the hold light will randomly come on flashing. When starting it, it will start rough with lots of vibration and then light will start to flash. Spark plugs andwires are new.
Any thoughts?
Did you have the problem before the new plugs and wires went in? If so, did the new parts help the problem at all? Did you have the ODB codes read yet? If so, what are the codes? If not, take it to a parts store to get the codes- many don't charge to do this.
avguy, plugs and wires were changed about 3 months ago for a tune up because it was running rough. The light was not on when those were changed at the time. Can the ODB code be checked without the Hold light being on. This activity is random. Today I started it and it ran fine, but yesterday I started and it started rough and the Hold light was flashing.
Thanks for your help!
Normally the check engine light being on will mean that a code has been set, but you should try to have it read now anyway. Autozone, and many of the other parts stores will scan for free, and sometimes even offer helpful advice about the problem.
Did installing the new plugs and wires eliminate the problem for some period of time? I understand this is random, but it may be important to know if the new parts helped, even if it was only for a short period of time. Random problems can be very hard to diagnose and misfire can be caused by a number of things, which is why it's important to provide every piece of related information that you have.
Sorry it took so long for me to get back to this. I went to Autozone and they wouldnt check it without the engine light on, so I had to wait for the engine light to come on. After it flashing along with the Hold light, the engine light just stayed on for the last week. I went to Autozone and they were able to read the codes. Codes: P0300 - Random misfire and P2610 - PCM/ECM internal failure. They told me that I needed a new ECM. If I get one from the salvage yard with the same properties (Automatic Tran, air conditioning,) do I need to get it flashed by a dealer? Or is that something I can do on my own?
Thanks.
No personal experience with that P2610 code, but the book says to check the power supply before replacing the ECM. So that means checking fuses and swapping relays; checking for corrosion on the fuse box connections, the battery wires and connections; checking grounds; and doing a load test on the battery. Some of these problems can be hard to find, such as when a battery cable is breaking down but hidden from view under the insulation. Sometimes pushing around wires while the vehicle is running (or trying to start) can flush out bad wires or connections. Another flavor of this is running or trying to start at night with no lights on, looking for arching. Spraying a bit of misted water onto the wires in darkness is another trick to help diagnose wiring problems.
Regarding an ECM replacement, the online parts outfits say that they always program their ECMs. OTOH you can find reports of guys swapping a used computer into various vehicles and having that work fine without reprogramming. But there are also stories of this not working out for other folks. So this is definitely a case of YMMV. The parts guys are selling them for somewhere around $250, so if you can find one at a boneyard, and the price is low enough for you to roll the dice, then by all means give it a shot.
Thanks for all your help....
Well all my problems was a blown head gasket !!!! Got new gasket and car runs great!!!! No more flashing lights check engine light off.. it was crazy how sometimes it would run great and sometimes not....... all the codes that would come up... hope this helps someone.......