How To Tell When A Car Is Not Worth Fixing

How To Tell When A Car Is Not Worth Fixing

Last Updated 26-Nov-2004


26-Nov-2004: The Maxima is gone. It's a good story. It involves a junkyard and a familiy with a bunch of happy guys and a pissed matriarch. Ask me about it sometime.

12-Jan-04: This is the story of fixing the Maxima. This car really should have been junked about a year ago. The problem is the more money and effort I put into fixing it, the more I become determined to keep it going. What I'm obsessing over right now is the ignition problem. If I could just fix that the rest of work would be worth it. It's amazingly hard to fix the ignition problem though. You don't want to just replace stuff that might be a problem because it's all so expensive. The crankshaft position sensor is $500 and I can't find one in a junkyard. They don't want to separate it from the engine. You can buy a whole junkyard engine for $1475 plus $25 delivery (to my house). I've seriously considered it. The spark coils are about $600/set and can't be found at a junkyard for the same reason. The engine control module is about $400, but you probably could find that at a junkyard for about half that. This leads to a real determination to prove which part is bad before replacing anything.

The story's by no means done. I'm afraid to drive it right now. I have to show you the ~$400 bill to have a bolt removed. The bolt was broken off inside the head. I think the messing around to do that caused an exhaust leak on the other head. I'm pretty sure the head will have to be removed to fix it. I looked on alldatadiy.com for about how long it takes to remove the head. It said something like 11.7 hours. Let's see, 12 hours at $85/hour... Looks like my weekend is shot.

Right Light


From the right distance and a good angle and the right light the car doesn't look all that bad.

Need More Tape


Get up close though and you can see we need new duct tape on the mirror. The tape holding the window up is still ok.

Lunar Unit


Zoom in on this and you can see that the car has almost covered the distance from the Earth to the Moon. Where's the dashboard though?

Where the Dash Is


There's the dashboard, in the back seat. The car has a chronic ignition problem. The engine will just suddenly start cutting out. Oftentimes it makes for a jerky top speed of 40 mph or so on the freeway. This annoys and confuses other drivers. It just annoys me. Sometimes the engine will even die. So far it has always started again. I know it's an electrical problem because the tachometer will drop to zero while the engine is still turning. Now I know the problem is not in the wiring behind the dash.

The Part Won't Come Out But the Oil Will


That axle has to come out. It's got a bad CV joint. That axle won't come out. The Haynes manual outlines a horrendous procedure for taking it out - involving supporting the engine with a jack and removing engine mounting stuff.

There's also a little puddle of oil forming exactly under the front center of the engine. I plan to pretend I didn't see that.

New Tools


There's three little bolts that are just out of reach. They are behind a big steel beam that supports the weight of the engine. I have a plan to avoid the horrendous Haynes procedure, and the best part of my plan is that I get to buy new tools to try to get at the three little hidden bolts. My favorite is the cute little ratchet. (Kind of the upper left of the picture. It's got a short little handle that flexes to different angles).

Void the Warranty


This voided the cute little ratchet's warranty.

Hold the Engine Up


Here you can see the horrendous situation I tried to avoid by buying more tools. That big steel beam being held out of the way is normally used to hold up the engine. The bottle jack is supporting the weight of the engine. Underneath, just behind the voided warranty cute little ratchet, you can see a good sized hammer. It's scary crawling underneath an engine supported by a bottle jack, and then beating on that engine with a good sized hammer.

Fire Wrench


Even scarier than crawling underneath an engine and beating on it with a hammer is crawling underneath and engine and heating it up with a torch. That's the OIL pan right next to the TORCH. (The idea is the heat expands the steel collar and makes it so the part can come out of the collar. The part wouldn't come out from just beating on it with a hammer).

Cute Wrench


This is just to show how the cute little ratchet can come in real handy. You can see the new axle part being attached to the collar. The duct tape here was to protect the rubber boot of the new axle while I slid the new axle in place.

Things Are Getting Better


This is just the other end of the new axle. There's a great deal of satisfaction when you reach this point.

Open ECM


Back to the ignition problem. The device in the center of the picture is the "Engine Control Module" (computer). I have the cover removed, and you can see two oscilloscope probes connected to the inside of the engine control module. This is an example of going to far.

Ready the Blinking Lights


Using the oscilloscope I couldn't tell for sure whether or not the engine control module was any good. If the problem was showing up it was to subtle when the engine was just idling in the garage. The effect is much more pronounced when driving in heavy traffic on a freeway. I didn't want to take the oscilloscope with me while driving, so I wired some blinky lights into the engine control module.

Schau die Blinkende Lichte Zu


This is what the blinky lights look like when driving. The success story here is that I have now shown the problem is not in the engine control module.

External Fuel Pressure Gauge


This is a classic example of the "Duct Tape Extra Gauges To The Windshield" diagnostic methodology.

External Fuel Pressure Gauge From the Inside


This is what the gauge looks like from the inside. Now I know fuel pressure is not the problem.

PNG with Winker's email address.  Darned spamers anyway.

Check Out Winker's Home Page
Home

+------------+
|   Website  |
| Created in |
|     vim    |
+------------+