to my understanding its supposed to be one or the other. why is it that i have both. the reason i'm asking is because my car shuts off in wot while idling (if that makes sense). before this i was hardly getting any power when accelerating (it would sound like i'm going 80 mph and it wouldn't let me get past 25)could it be my maf sensor or map sensor? someone is stating that it is a blown head gasket but it doesn't add up to be. going to get a compression test soon, but i'm getting the impression that it could be the catalytic converter. when i disconnect the maf sensor it makes no difference in the way it acts. What is possibly the problem & what is possibly the solution?????

 

the 2.8 car does not have a map sensor it has a baro sensor there should be no vacum line connected to it. if it is hooked ot vacum it will scxrew up the way the car runs

 

Useful info.. just bought a new vacuum line & connected it 2 the map/baro because I noticed a snapped line running from my vacuum switch (?? Maybe) and it seemed like it was supposed 2 be plugged 2 the map according to the vacuum diagram so waz the line justified in being snapped?
Will post pics once I reach a pc. But the problems mentioned in my first post started before I. Connected the map vac.

 

Um, no MAP or BARO sensors on an 86, period. MAF only. 85-89 cars were MAF only, 90-92 and 82-85 carbed cars used MAP (carbs also use a BARO sensor in some cases).

That car has GOT to be posting trouble codes... Find out which and post up.

 

pulled a couple codes but they weren't hard codes. they popped up from me messing around with the sensors. restarted ecm and pulled nothin. my main focus is to find out why my car won't drive over 25 mph..

i noticed the snapped vac line in the pic after looking under the hood 2 find out why my car waz acting up. after that, i connected the line to the map sensor being that it was the only visible place that the snapped line running from the vac switch seemed to belong.

 

Again, THERE IS NOT A MAP SENSOR ON AN F-BODY EQUIPPED WITH THE 1227302 ECM (which is what your 86 has). IT IS MAF ONLY. No, I don't care what Haynes says. It's wrong, and that isn't the only place it is wrong.

Also, there is no such animal as a "soft" code on OBDI, or pending codes, or any of that stuff.

That thing that is on the ignition coil bracket is the Electronic Vacuum Regulator Valve, which has an attached switch to tell the ECM whether or not the EVRV is providing a vacuum signal to the EGR valve, which is how it will post a code 32.

 

???????interesting.
i never even mentioned haynes... ??

but uh, i'm guessing that itz also wrong underneath my hood being that i personally OBSERVED what appears to be a map/baro sensor. just uploaded pics (3rd pic, post #6)and i never pulled 32.
besides that, the ecm could easily mistake similar conditions to be a certain problem until those conditions are reversed. so i'm not sure what you mean about soft vs. hard codes not being existent.

where does the SINGLE VACUUM line from the "evrv" go the diagram says it goes to vac sw.

 

The bottom line to the EVRV comes from the throttle body's ported vacuum port.

The top line from the EVRV goes to BOTH the vacuum switch AND the EGR valve. Should have a T in it.

What you have in that pic is the vacuum switch for the EGR, period. It apparently closes with the EVRV providing a vacuum signal to the valve. 2 of the wires going into it are for the EVRV, the other 2 being the power and ground for the switch.

A MAP sensor has 3 wires, green, black, and gray, and is generally in a GREEN connector (except boosted cars such as the GN which have different color connectors based on how far the sensor can read, be it 2 or 3x the normal atmospheric pressure).

On OBDI, if the ECM is posting a code, it's seeing an error. It doesn't set a code for something that could potentially be a problem. Granted, it's not "smart" enough to know exactly what the problem is, but it's telling you when it sees something that is out of system specifications (code 45 meaning rich exhaust could be a bad MAF, bad O2S, bad TPS, or weak spark).

 

so this is the connection i should be making? if yu could see, its red and green lines representing the vac hose. And as far as the ecm that was just a misunderstanding. i was speaking in the sense of a situation where yu disconnect somethin and cause the ecm to place a code. so basically i unintentionally manipulated the ecm. which in turn made it necessary for me to reset and fish 4 codes again.

 

That would be why the top hose connection on the valve has the second nipple on it. Apparently someone removed the line that's supposed to be there.

 

this hose in front of my hand? took it off for the pic.. but the very first time i actually took a look at it since buying the car it waz snapped like you see below. and i never found the other end.

 

I have a couple pics of how it's supposed to be, but take a rubber hose and connect the switch to either the end of the broken line or the nipple it's on. The pics are on another computer that doesn't have access to the Web, so it's going to probably be tomorrow before I get them loaded to PhotoBucket. I may have them floating around here, but a search could take forever...

 

Completely agree with maverik the map sensor has 3 ports and the maf sensor is used instead of the map sensor the thing you are looking at is connected to the egr valve the sensor on the egr valve has 4 ports and does not look like a map sensor thats why i was wondering why there were 4 ports

 

Sorry to bother, but can anyone tell me what the device is called in the picture that you are holding & where to buy a new one? Mine has wires broken off. So it is no longer usable. But I can't for the life of me find it online. I've searched for Electronic Vacuum Regulator Valve. I've looked for EVRV. I've done general searches on Google & eBay for Vacuum system and devices. This is the only place online that I've even found a picture of it. Any help would be greatly appreciated. I was hoping maybe there was a website to find old parts for these cars or something.

 

Does anyon3 know the part number to this sensor and solenoid? I cant seem to find it. Thanks in advance

 

I can't help you out, but maybe you can help me. I need to know how you have your ignition Coil wires hooked-up. You have (2) black wires coming from the connector plug at the ignition module let hand side. One is a Black wire with a white stripe. and one is black. The white strip coming from the 2-wire plug at the distributor ignition module is a ground wire, Right hand side one is a live wire.
Coming out of the wiring harness is a black and white wire with a white stripe and a Pink/Black wire . You have 2-plugs mounted to the coil. With 2 wires on those plugs.. One is pink and one is white. What color wires hook-up to those 2-plugs. That's what I need to know.