Finding a MAP sensor

[flashlight]

Does anyone know where I can get a MAP sensor that is resonably priced. At the moment I'm up for any suggestions. I have a manual transmission. The part that I'm looking for is 18590-50G01. I have a 94 Geo metro.

[RossT]

I have a 5 or 6 at home, will check the numbers when I get home.

Does this have to do with your car not starting?

[flashlight]

My dad and I got it figured out that it is either the MAP sensor, or there is a slim possibility that something else is wrong with my car. So far I can get the car to turn over but it won't catch and start up. Also while I am cranking the engine I can smell the gas fumes as they are being pumped into the engine. Does anyone have any new ideas on what the problem could be?

[metro_roy]

Flash:

I see in reading prior posts of yours that you have the Factory Service Manual for your car. You can read up on the MAP sensor and confirm if I'm right about this or not, but here is what I'm thinking. Warning, I'm not an expert. I believe that a faulty MAP sensor in your car would not prevent it from starting. It would run badly but should start. It also would set a code and your check engine light would come on. Have you checked for codes? Have you checked for spark at each of the plugs? Does it sound at all likes its trying to run when cranking? Have you checked that your timing belt isn't broke, by seeing that the rotor of the distributor turns when cranking? Do you have a timing light or know somebody you can borrow one from?

[flashlight]

It does sound like it is trying to start. It backfires so I know that it is getting fuel I just can't get it to catch and run. If the rotor wasn't turning wouldn't the engine be dead when trying to turn the engine over meaning there wouldn't even be a spark. I would check for codes but made the mistake of disconnecting the negative cable from the battery when I changed the fuel filter. That's what I thought was the problem in the first place. In removing that cable it clears all codes so whatever ones were stored in there were erased. Is there another way to test.

[flashlight]

So does the one you have, is it a 5 or a 6? If it's a 5 would you be willing to send it to me as long as I paid you for it?

Thanks,
flashlight

[91Caprice9c1]

1) How did the problem begin/when and how did you notice?

There are a lot of possible malfunctions. I'll mention a few. A MAP fault is not one of them

Given your description I wouldn't think a broken timing belt is your problem, however, I'd be highly inclined to check cranking vacuum from the brake booster hose expecting to find evidence of a timing belt that has slipped and is on it's way out or a melted down catalytic converter.

What condition are your ignition rotor and distributor cap in? If they are old you may take the cap off to look for carbon tracks and/or evidence of cross firing. Poor spark plug cables may also be suspect.

Check for good battery terminal and ground connections including those sensor grounds attached at the back of the intake manifold via a 10mm hex bolt.

Report back.

-MechanicMatt

[RossT]

I think I have your part, I thought this came from a 95, but the numbers match what you gve me. Check out the pic, if you want it your welcome to it.

But, I don't think it will solve your problem. Now that you know you have gas, and you have checked for spark at each plug?, I would suspect something is up with the timing. Either the belt is broken of has stretched and slipped a tooth or two. You will need to remove the timing belt cover to inspect the belt. Make sure it tight too, your timing belt tesnioner could have bit the dust.



Also check all your ground wires. There are a couple that attach to the back side of the TB, if these are cut or dirty they can drive you nuts.

[dwendt1978]

I'd do what these guys are suggesting Flashlight. Pull the cap and see if your rotor is turning at all. If it is, there is still a possiblity it jumped a couple of teeth putting the timing so far off it won't start.

All though I've never replaced a timing belt on a metro, It looks like pulling the cover off to inspect the belt is pretty easy to do.

And as far as a bad ground goes.....they can cause the craziest things. That's always a good place to look as well.

[leonbentz]

I would check and make sure that your timing belt is accurate. It should be simple enough. Just check by your timing marks on the crank pulley and check the cam gear position.

[leonbentz]

If you loosen the top bolts of the timing belt cover, you should be able to see the upper timing mark and make sure it's aligned with the mark in the valve cover

[leonbentz]