MAP + MAF???

[50gt1988]

Ok how would the car normally run if the Maf and the Map were connected? I did my maf conversion about 2 months ago and forgot to unplug the MAP sensor from the vacuum line and its run fine. I unplugged it and now it runs the same as it did before? Think my computers bad?
BTW: My computers been throwing bogus codes and goes through wierd occurances, and now the car won't start hot?

 

[jrichker]

Dump the codes and see what the computer says is wrong. Then post them and I will try to help.

Here's the link to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for years, and it works great.

See http://www.troublecodes.net/Ford/
OR
See http://www.mustangworks.com/articles/electronics/eec-iv_codes.html

IF your car is an 86-88 stang, you'll have to use the test lamp or voltmeter method. There is no functional check engine light on the 86-88's except possibly the Cali Mass Air cars.

Codes have different answers if the engine is running from the answers that it has when the engine isn't running. It helps a lot to know if you had the engine running when you ran the test.

Trouble codes are either 2 digit or 3 digit, there are no cars that use both 2 digit codes and 3 digit codes.

For those who are intimidated by all the wires & connections, see http://www.actron.com/product_detail.php?pid=16153 for what a typical hand scanner looks like. Normal retail price is about $30 or so at AutoZone or Walmart.

Or for a nicer scanner see http://www.midwayautosupply.com/detailedproductdescription.asp?3829 – It has a 3 digit LCD display so that you don’t have to count flashes or beeps.. Cost is $35.

 

[50gt1988]

You've have helped me with codes before and the codes i pulled were all bad sensor codes that you said may be caused by a bad ground in the computer. Which is another reason I think its the ecu.

 

[jrichker]

A bad sensor ground. pin 46, black/white wire can make all kinds of sensor problems pop up.

Check the resistance between the black/white wire on the MAP/BARO sensor and then the black/white wire on the EGR and the same wire on the TPS. It should be less than 1 ohm. Next check the resistance between the black/white wire and the negative battery post. It should be less than 1 ohm.