94 Excel Suddenly died

I have a 94 excel which died on me about a month ago with no warning. The car will crank with lots of juice but has no spark. I am some what mechanically inclined but am completely stumped when it comes to
electrical and ignition systems on vehicles.
So far I have replaced the distributor cap, rotor and the coil. None of these have fixed the problem. I think I might be looking in the wrong place. I have seen the post on similar problems but am in need of a little bit of help. I figured if I could get the car to spit out codes I might be able to narrow down the problem. I have not been able to get any codes using a light meter. I think I have located the place in the fuse box where to connect it, but I could be wrong. Do I need to have the key on when performing these tests? Does the ground for my light meter need to connected to one of the terminals in the fuse box or simply grounded to the car?
Any help with getting this car running would be a very much appreciated.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
sounds like the computer is shot
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
jimmyh wrote:

Not likely. The computers fail, but fail rarely compared to the sensors. Likely a sensor failure, the trick is finding out which one.
Matt
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Silverfoot wrote:

Autozone, VIP and other parts/service stores at no charge, or you can buy a code reader there. I managed to get codes from my '94 Excel using a voltmeter. IIRC, the access panel is under the dash on the left side, but I don't remember the entire procedure.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Thanks for the replys - I kinda thought it was either the computer or the crank position sensor. I have read alot posts about the sensor. Is it possible to use a light meter as opposed to a voltmeter? Is the access panel the access to the fuse box? Does anybody now where the crank position sensor is located? What is the sensor worth?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Silverfoot wrote:

I doubt it, as the signal is very weak. It probably won't illuminate a bulb, but it might work with a low-power LED.

No, the computer is higher up under the dash. It's easy to spot, as it has two large wiring harnesses connected to it. IIRC, the metal cover on mine was black.

Can't help you here, sorry. You could try going to www.hmaservice.com, signing up (it's free), then checking to see if they have the Excel manual online. BTW, the site only works with Internet Explorer.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Thanks Brian - I was using trying to using a light meter against some post inside the fuse box. I had been on the hmaservice sight many times and couldn't get anywhere on it. I was using firefox. I logged in use IE and it came up fine.
It looks like I might be able to get somewhere. I will keep you all posted. I am sure I will have more questions as I proceed. Thanks again.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
You'll want to use the diagnostic connector inside the fuse box. You can ground to a terminal there or anywhere on the car. I always found the door check pin convenient (as long as you remember to remove the clip before closing the door). It won't work with a test light. I have seen it work with a diode. I've used a sweep meter when the scan tool was broken.
The crank/cam sensors are located inside the distributor. You may want to check the timing belt first. Since both sensors run off the cam, nothing happens if the cam doesn't turn.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Brian Nystrom wrote:

I know on the '94 Scoupe you could use a volt meter.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Thanks for the advice - I have digital meter - I think that a sweep meter may be able to follow. I am going to try with the digital meter tonight and at least see if I can get something pumping out of it. There are 3 pins located at the top inside the fuse box - should any of these three work? I am going to get these codes one of these days!
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I believe the connector is in the bottom of the fuse box. There will be several pins there, but I believe there's something like 10 to 14 spaces for pins total.
If you go to www.hmaservice.com and go through the fuel section of the shop manual, it'll show you how to do this.
I'd be very surprised if you can get anything out of the digital meter. The codes are displayed as two digits with the long sweeps indicating the tens digit and the short sweeps indicating the units digit.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I went to www.hmaservice.com and went throught the fuel section. It was very helpful. I was able to locate the connector in the fuse box. It showed me which pins to use. I bought an analog voltage meter. I couldn't get any results out of the meter. I had the ignition on, my ground was solid - I checked this by touching the positive lead from the multimeter to one of the fuses where I got a reading. I charged up the batter so it had a full charge - what is going on? The manual said that if the ECM was shot - You would get a constant reading with the meter. I really need some help! Thanks in advance.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Sounds like you have no output from the ECM. Does your check engine lamp come on when you turn the key on? If not, check for proper power and ground to the ECM.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Last night I actually read about the check engine light and how it should come on if there is a problem. It doesn't come on at all when I turn the key. I did check to ensure the ECM was grounded. I wasn't sure how to do this so I simply ensured that the bolt used to fasten the ECM to the vehicle was snug. It had two black wires under it so I figured it was some sort of ground. How do I check for Power and ground to the ECM?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On the www.hmaservice.com site, there's a tab labeled "ETM." This tab leads to the schematics. You'll be interested in the MFI schematic. Simply check for power in all the wires that should have power (using a test light or your voltmeter). Simply unplug the ECM and check the wires in the harness. If all the wires that should have power do have power, then check your ground. Choose one of the powered wires and then touch the ground wires and make sure you get the typical 12V.
At this point, I suspect you may have a blown fuse or a bad MFI relay. You might wish to check all the fuses inside and out first.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I was able to locate the MFI - I ran out of time last night or should I say the Mosquitos got the better of me. I will be checking the MFI tonight. Last night I was pretty frustrated I was almost giving up hope. But I think that you may be onto something with a bad MFI relay. I did check all the fuses inside the car as well as a couple of fuses located close to the Windshield washer resevoir. The seemed to check out just fine. Is there any other locations I should be checking out? I have printed off pages and pages from the hmaservice website. One question - to check connectivity for the ECM ground, can I tapp into a fuse with power and touch the ground wire to the ECM grounds on the wire harness?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
You want to do this ground testing with the ECM *unplugged* and you want to do it from the ECM connectors. You can use a voltmeter or test light with one end on a wire with power (or a powered fuse like you mentioned) and the other end on the terminal in the connector. Just touch the terminals, don't stick your probes into them-- this can damage the terminals.
It's been a while since I've worked on one of these. I don't recall whether there is a sizeable underhood fuse block or not. If so, it should be a black box of reasonable size and pretty much readily identifiable.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Related Threads

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.