Sensor question
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by CFI-EFI
That must be a carry over from earlier years, and a misprint for your 1987. With the ignition on, engine off, remove the connector from the switch and ground the wire in the connector. When the wire to the fan is grounded, the fan will come on. If it is the gauge sending unit, the gauge will max out.
RACE ON!!!
RACE ON!!!
Jake
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by Bob88Convertible
OK, now that we cleared that up, I think.
I still have no place to put these sensors in the heads. What other options do I have to put these??? Thanks.
Bob
I still have no place to put these sensors in the heads. What other options do I have to put these??? Thanks.Bob
I suspect the sensors/senders are tuned to the temps in the cylinder heads, so installing them in the intake would probably give you unreliable readings.
From what I recall, guys who have had the same "no holes in the heads" problem have had the heads drilled and tapped for the sensors/senders.
Any machine shop should be able to do it inexpensively.
I would first call Brodix just to make sure that the stock locations on THEIR heads can be used.
Jake
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by JAKE
Did you check to be sure there aren't holes with plugs screwed into threaded holes?
I recall AFR heads use to come without the necessary holes drilled and tapped for the sensors/senders. You may be walking the same road.
Jake
I recall AFR heads use to come without the necessary holes drilled and tapped for the sensors/senders. You may be walking the same road.
Jake
RACE ON!!!
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Is it the same on the 88?
WRONG! The IP temperature gauge sending unit is in the right head, between the #6 and the #8 spark plugs.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by 65Z01
Yes my aux fan switch is located on the LH side of the block below #1 & #3 spark plugs.
Nope, not on an '88 L98. Mine is located just above the starter sol, in the block.
Nope, not on an '88 L98. Mine is located just above the starter sol, in the block.
Jake
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by 65Z01
Yes my aux fan switch is located on the LH side of the block below #1 & #3 spark plugs.
Originally Posted by 65Z01
Nope, not on an '88 L98. Mine is located just above the starter sol, in the block.
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Melting Slicks
Joined: Oct 2001
Posts: 2,314
Likes: 108
From: Brandon Fl
Originally Posted by CFI-EFI
That must be a carry over from earlier years, and a misprint for your 1987. With the ignition on, engine off, remove the connector from the switch and ground the wire in the connector. When the wire to the fan is grounded, the fan will come on. If it is the gauge sending unit, the gauge will max out.
RACE ON!!!
RACE ON!!!
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
...but your 1988 came from the factory with the gauge sensor in the right head.
OK I did this. The drivers side made my aux. fan come on.(the one in front of the rad.) the Pass. side one did nothing. Which one runs the main fan?
The sensor for the ECM is in the front of the intake base to the right of the TB. The ECM and only the ECM controls the main fan.
If you want to test main fan control, open the small connector in the A/C pressure line and start the engine; the main fan should be running.
If that passes, jumper ALDL pins A&B and start the engine. The SES will flast at 2Hz for a while and then will slow to 1Hz when the ECM goes into closed loop mode. This requires a preset time delay, the O2 sensor in operation and coolant temp at a preset value. This will verfiy that the ECM's coolant temp sensor is working.
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Steve87VETTE
OK I did this. The drivers side made my aux. fan come on.(the one in front of the rad.) the Pass. side one did nothing. Which one runs the main fan?
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Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by 65Z01
Not true. Even my '88 GM Shop Manual shows the gauge sensor below #6 & #8 in the block and the aux fan sw in the block below #1 & #3, just where they are located on my '88.
Originally Posted by 65Z01
Nope, not on an '88 L98. Mine is located just above the starter sol, in the block.
RACE ON!!!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
For those of you that say your temp gauge sensor and/or auxiliary fan switch are in the block, can you please point out where, on this block?
So all can see, here is where the sensor and switch REALLY mount.
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So all can see, here is where the sensor and switch REALLY mount.
RACE ON!!!
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by JAKE
I just saw this post. I'll take some shots today and post them.
Jake
Jake
I haven't forgotten you though.
Jake
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
Originally Posted by CFI-EFI
If the holes are not just simply plugged, I would contact Brodix for advice as where, exactly, to drill and tap those holes. I'd bet where they are in the stock heads would be OK. I doubt you have two extra holes into water passages in your intake manifold.
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RACE ON!!!
There should at least be some raised bosses where the holes ought to be drilled and tapped. 65Z01, where is your knock sensor installed right now?
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by CFI-EFI
How about it, 65Z01. Can you show is where your temp gauge sender and fan switch are mounted? How about the knock sensor?
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RACE ON!!!
Jake
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
I wasn't rubbing it in. I gave up asking days ago. I was letting the thread die, but I disagree. I don't think 65Z01 Has been convinced. He has posted numerous times, "not in and '88". You've said it, I've said it. Others have said it. Every time he came back with a refusal. I wasn't the first to post pictures. He has ignored repeated request for the location if his knock sensor. I don't believe he does know and it doesn't seem as though he is about to look at his own car to enlighten even himself. Him not knowing doesn't hurt you and me, but I hate to see the poison spread by someone who is that closed minded. 
RACE ON!!!
PS. After all, look what got this thread started. It was a request for info on where to mount the sensor and switch in the new undrilled heads.
RACE ON!!!
PS. After all, look what got this thread started. It was a request for info on where to mount the sensor and switch in the new undrilled heads.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
I recall what Chief Master Sergeant Scarborough told me more years ago than I care to admit. "When you admit to your mistakes, it builds character".
I guess I've got more character than most, having had to admit to so many. It comes harder to do for some than for others though. That may be the case now.
Sort of like drinking your booze straight, like the old time cowboys did when they bellied up to the bar; you've got to get use to it.
Jake
I guess I've got more character than most, having had to admit to so many. It comes harder to do for some than for others though. That may be the case now.
Sort of like drinking your booze straight, like the old time cowboys did when they bellied up to the bar; you've got to get use to it.
Jake