can sombody tell me the locationds of the sensors on a 91 3.1 V6 camaro. I'm specificly interested in the Knock sensor,and temp sender. 9 need exact locations inside block, outside block, obve somethnig , underneath something. everything.

Here's the list.
Knock sensor: Passenger's side of block, underneath the exhaust manifold, next to the starter.
Temp sensor (coolant): Front top of engine, underneath the throttle body. Has black and yellow(?) wires running to it.
Temp sensor (intake air): Screwed to a nut welded to the side of the air cleaner can. Probably on the front side of the can, yellow and purple wires.
MAP sensor: (I don't have one, not really sure, if wrong, someone correct me): Driver's side of engine bay near brake booster. Has a green three-wire plug and a vacuum line running to it.
O2 sensor: Underneath the car, in the engine crossover pipe, near the passenger's side lower A arm. Single black wire running to it, 7/8", will probably need heat to replace.
Throttle position sensor: Passenger's side of the throttle body, has 3 wires running to it, and is non-adjustable for the most part.
Idle air control motor: Above the TPS, has a four-wire connector, 2 blue and 2 green.
Oil pressure sending unit (also sensor): Near the oil filter on the driver's side, has 3 wires running to it. White, orange, and black.
Any others, I've forgotten, feel free to ask. Also, your ECM (engine computer) is up under the dash on the passenger's side of the car. You need to remove both lower panels to get at it. (Just in case you needed to know)

:edit: Just noticed you're across the pond. (Swap the driver's side location for the TPS and the knock sensor).

still need th temp sender for the gauge.

Im not sure of the wire colors, but the MAP sensor is on the pass. side bolted to the lip on the firewall. Almost right above the ign coil.
There is another coolent temp sensor in the front of the driver side head.

I think You both mean the same temp sensor.

I'm looking for a 1 wire ( green ) sender unit that goes to the gauges.


( also, does the knock sensor bolt into a waterplug ( I mean, if i get it out, will I get a shower of water over me ? same goes for the temp sender to the gauge.

The knock sensor does act like a coolent drain plug for the pass side of the engine.

That one is under the TB I believe on the intake manifold and the one that kicks the fan on is on the back of the passenger head.

You didn't say anything about the temp sender.
But, anyways, the sender is the single wire unit he has in the second pic above, the one with the funky looking connector and the green wire running to it. Your 3.1 does NOT have the fan switch in this same position on the pass side head, as it completely relies on the ECM and the CTS for switching the fan relay on and off.

Ok so where do i hook up an external aftermarket temperature gauge? I am going batty with not understanding where...

or you put the new one in place of the old 1.
or you drill a hole in your block. or in another place where there is running hot water from your block. ( do not place it behind your thermostat since it wont measure the water then till the thermostat opens)

My 91rs 3.1 temp sensor is front driver's side right behind the a/c punp it is brass with a flat like top with a slide on kinda 90 degree connector. This runs the gauge only nothing else that I know of.

yups, the small 1 near the collector only runs the gauge.
already found that 1. changed he senderwith the new 1 rom nordskog together with giving it an all new wire to my dash.
I can tell you, this thing is accurate
with my 180 thermostat. on the freeway, my temp is between 179 and 181 degrees.
thats less then a 1% error read.

is this the same for the 2.8 v6's to? cause i think i know where my coolent temp sensor is...but how to i get to it to change it?

You can either do it the hard way by removing the upper half of the plenum or get yourself a flex-joint for a 3/8" ratchet and use a 5/8" (please tell me I'm right) deep socket to get to it from the driver's side of the engine.
And for those newbies out there, the 2.8 and the 3.1 are the same engine with the exception of the computer and fuel injection system, crankshaft, and pistons.

Hi -

I'm in the middle of changing a head gasket, and I found this sensor (sender?) was completely broken--literlly, the top half of the sensor was completely missing, and so I don't know what the lead coming off of it looked like, or where it ran to. I don't even know if I need the part called Coolant Temp Sensor or Coolant Temp Sender---they are both the same size, but the connection is different. (BTW, the previous owner has hardwired th fan to run all thetime, probably because he was too lazy to replace the sensor.) See pics here: http://www.thirdgen.org/techboard/te...me-sensor.html (Please Help:Name that sensor!)

Can someone please post a photo of what this (the temp sensor/sender connection on the back of the passenger's side head) is supposed to look like?

Thanks,

-Mark

You're looking for the 2-wire sensor in the pics above (next to the thermostat housing, top pic). The connector looks almost the same as does the connector for the air temp sensor in your air cleaner can, except it's black instead of gray.

:edit: It may not be that your fan has been hardwired to run. Your ECM may just be running the fan because it doesn't know how hot the engine is. Also, expect cruddy mileage and nearly black exhaust, as the ECM will be adding fuel because it thinks the engine temp is below zero (IIRC, anyways). I worked on a 95 Grand Prix that had this problem.

hey guys, i ran into a problem with this, i got the old unit out but now i cant get the new sensor into the hole?, it just sits and spins on me, any help?

You'll want to pull the upper plenum off and get it started by hand... DO NOT use a wrench to get it started as you could strip out the threads in the intake by cross-threading the sensor with the intake threads (if you haven't cross-threaded it already).

BTW, my mistake... It's a 3/4" wrench or socket you use on the CTS.

i have it off, i cant get the new one started, the old one goes in jsut fine but that new one just wont budge

Check the 2 sensors side by side, comparing the threads. And not just 2 threads, check the whole length from the thermistor end (in the engine) to the part the wrench sits on. If there's nothing in the way and it's not going in, you probably have either bad threads in the intake or the wrong replacement sensor, or some guy at the machine shop that made the sensor body screwed up the threads good.

checked the threads they are right, the replacemnt is alittle longer and alittle wider, i just dont understand, the original goes in fine but the new one wont go in.....

If the new sensor is wider (at the threads), that's why it's not going in. It's not going to fit in the hole unless you rethread the hole larger. Take it back, take the old one in, and tell the guy you need one just like it. Don't rethread the hole larger as you may need another replacement sometime that is the right size and it then won't fit.

will zone take it back? iv already got tape on the threads so it didnt lock to the metal, i havent plugged it in yet

Another thing: Get in the habit of NOT using thread tape on the coolant sensors, with the exception of the knock sensor (that you had in the 91 by the starter). The gauge sender, in particular, grounds through the threads into the cylinder head, and the tape can mess up the resistance readings (you can possibly get away from it in the intake sensors but I wouldn't advise doing so on a regular basis to avoid a habit in case you get stuck working on a late-model car that has the all-in-one gauge and ECM sender). Get a wire brush and clean the tape off (preferably brass). Just tell them you bought the wrong part (or they made a mistake and gave you the wrong part in the right box... Had that happen at NAPA a few times).

ok, i have the recipet and everything but my step dad did the tape when he was lookin at it today when i was at school, i didnt have to take the plenum off to get the original out...

Or, maybe if you get lucky enough, you can find the end of the tape and unwind it...

yeah..

I bought a temp sensor the other day and it already had red tape on it. Is that normal. It is like half way up the threads. When I read this and you mentioned not to use tape I thought it was odd. Got it at The new O'reilly's they took over checkers.

If it's the 2-wire unit, it's fine... Don't use tape on the single wire unit.