Shawn, I have to say, that labor rate is pretty darned steep. Maybe that is the going rate a dealership charges in your area. In my area it's about $80 - $90 per hour.
If you have equipment that will allow you to diagnose misfires and which cylinder they are occurring in and you can get your cousin to help you swap the ignition coils, that seems like the way to go.
Looking closely at the picture of the engine bay of your car, the ignition coils and the spark plug wires, I spotted something that may be very telling; as we look at that picture and look at the ignition coil on the left of the picture/the one closest to the front of the car and compare it with the one on the right, the one closest to the firewall/windshield,
the ignition coils look different. With the ignition coil on the left, it doesn't look as dirty as the one on the right. Also, the left ignition coil doesn't have numbers on it indicating which spark plug wire goes to which ignition coil terminal, whereas the one on the right
does. Ignition coils that have the number of which cylinder the terminal goes to tend to be an original equipment part. I have never seen an aftermarket ignition coil that has those identifying cylinder numbers on it.
Now, this would seem to indicate that the left side/front ignition coil has been replaced and is newer than the other one, the right side/rear ignition coil has not been replaced and it's the original equipment ignition coil, with almost 150,000 miles on it. That's a long way for an ignition coil to go. Look closely at the picture and you will see that right side/rear/older ignition coil has the left terminal identified as going to the
#3 cylinder,
the very cylinder that is having the misfire problem! Very interesting!
:thumbsup:
It looks to me like the previous owner of the car had the left side/front ignition coil fail and only replaced
that ignition coil, (probably on the advice of an inexperienced automotive technician or the owner themselves), and not the other one too, which should have been done because both ignition coils have the same amount of wear and tear on them and if one fails, well the other one is right behind it. It's kind of like having a pair of shoes and the left shoe gets a hole in it, but instead of replacing the pair of shoes, only one is replaced. Of course, no one would do that, but suddenly when it comes to a vehicle that travels 65 mph down the highway, many people get cheap. Go figure. :thumbdown:
So we seem to have more clues that the #3 cylinder misfire is being caused by an old and weak ignition coil. Now, please, don't yet go and replace it with a new ignition coil, because we aren't absolutely certain that is the problem yet, but the evidence is building. At O'Reilly Auto Parts, they have an ignition coil for your Corolla for $82.99 and I suspect that one is probably a made in China part as it has the lowest price, which is not desirable at all, as made in China parts, (in my humble opinion), tend to be comparatively low quality and break or fail at a much higher rate than parts made in the U.S.A., or at least in North America. Over the years, I have had absolutely miserable results with made in China parts and I refuse to install them in my cars anymore. If it's made in China, I wont buy it. Period. How can you tell if the part is made in China? Check the box it came in and if that doesn't list where it's made, open the box and check the part itself. O'Reilly's also lists a BWD ignition coil for your Corolla and their website says to call for pricing and availability. The link is below. BWD is a very good quality ignition coil and it's worth it to pay more for it. If they don't have the BWD coil in stock, generally auto parts stores can get any part you need overnight and at no extra charge. A high quality ignition coil will help the engine to run smoother, start easier, have more power and better fuel economy.
http://www.oreillyauto.com/site/c/search.oap?eyword=ignition+coil&year=1999&make=Toyota&model=Corolla&vi=5018313
Now, when you swap the ignition coils and if the misfire then moves from cylinder #3 to another cylinder, then we know for a fact that ignition coil is weak and needs to be replaced. To reduce hassle and save time, it's a good idea to have the replacement ignition coil right there with you and ready to go. So purchase it ahead of time. If the coil turns out not to be the problem, you can always return the new coil you purchased and get a refund. Make certain you keep your receipt or they wont give you a refund.
Next, when the ignition coils are swapped right to left and left to right, it is
vitally important that the spark plug wires don't get mixed up and plugged into the incorrect terminals on the ignition coils. If this happens, the firing order of the cylinders will be incorrect and the engine might not run at all and if it does, it will run very roughly and can cause serious internal engine damage as the spark plugs will be firing out of time, or out of their correct order.
So when the ignition coils are swapped, this job must be done slowly and methodically with no interruptions from cell phones ringing, a radio playing, etc., and 100% focus must be paid to keeping those spark plug wires correctly routed to the ignition coils. If this is not done, it is very easy to get the spark plug wires plugged into the incorrect ignition coil terminal, the cylinders are now out of time/order and then the aforementioned problems will occur. What you can do to help avoid this problem, (on top of working slowly and methodically), is to use masking tape and a black felt marker pen to label each spark plug wire and each ignition coil terminal they go to
before you disconnect them to swap the ignition coils.
By the picture you posted, it looks like the spark plug wires are already labelled/numbered by the manufacturer, so now all you'll need to label is the ignition coil terminals and which spark plug wire goes to which terminal. This is very, very important.
Next, I looked up the firing order for your Corolla's engine and it's supposed to be 1, 3, 4, 2 -
http://www.2carpros.com/questions/toyota-corolla-1999-toyota-corolla-firing-order
Looking at your engine as you open the hood, (as in the above diagram), the cylinders are numbered 1 through 4 left to right. So if you get the order of the spark plug wires mixed up with the correct ignition coil terminal they go to, referring to the above diagram will save your butt. :thumbsup:
Now, the firing order of 1, 3, 4, 2 also supports that the right side/closest to the firewall/front window ignition coil could be weak and is causing the misfire problem.
Looking at the first diagram above and we can see that starting with the firing order of the #1 spark plug, that spark plug wire is routed to the left side/front ignition coil, the one that looks like it has been replaced. Next in the firing order is the #3 spark plug and we can see that spark plug wire is routed to the right side/back ignition coil, the coil that looks like it has never been replaced. So if that coil is weak and doesn't have enough electricity/spark to make the #3 spark plug fire, that spark plug will misfire and the electricity built up inside the coil
will not discharge,
but stay inside the coil. Next in the firing order is the #4 spark plug and we can see by the first diagram above that returns to the left side/front ignition coil, (again, the one that looks like it has been replaced). Now, the last spark plug in the firing order is #2 and that returns to the right side/back/suspected weak ignition coil again. Since the #3 spark plug didn't fire when it was supposed to and the electricity didn't discharge from the ignition coil, but remained inside the coil and now the #2 spark plug needs to fire, the weak coil will use the electricity that didn't discharge for the #3 spark plug and combined with the spark/electricity it now has to fire the #2 spark plug, that could provide enough electricity to now make the #2 spark plug fire even though the coil could be weak. I think this may be providing even more evidence that the right/back side ignition coil is weak.
Now again, don't just go and replace that coil, because if it turns out that is not the problem, you will not be able to return that brand new coil and get your money back, because the part has been used and the auto parts store will not take it back. Diagnose the problem first by swapping the coils and seeing if the misfire now goes to another cylinder.
Lastly, with the #3 spark plug misfiring, it is very likely fuel fouled and may now misfire because of that, even though a new ignition coil has been installed. When all is said and done, that spark plug should be removed and visually inspected to see if it looks fouled. If it is, it should be replaced with the same brand and number spark plug.
It's possible that this misfiring problem is twofold and not only is the right side/rear ignition coil weak, but it could also be an internal engine problem on that #3 cylinder. This is
very unlikely, but it is a possibility. I just wanted to mention that so you're prepared if that is the case.
So there you go Shawn. I hope this helps you out and gets your car up on its feet again. :thumbsup:
Keep me posted.