 Diagnoses needed |
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| G e o r g e |
 Jul 28 2008, 07:13 PM
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#1
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Dr  Group: Members Posts: 1,905 Joined: 20-September 05 From: Southern Cal Member No.: 4,832 Region Association: None 
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OK
I have head temp sensors on # 1 and 3 on a type 4 # 1 gives me readings at 180 after idle warm up 4- 5 min # 3 gives me 260 after a short ( 1/4 mile ) drive # 1 is the same, but # 3 is climbing towards 350 what can cause this? is this a tuning issue? can this be a timing issue? can this be a assembly issue? the factory sensor tells my fuel injection the the temps are as high as the gauge reads I'm just looking for all of the possibilities so I can start to run thru them |
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| orange914 |
Jul 28 2008, 08:58 PM
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#2
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
QUOTE(George H. @ Jul 28 2008, 06:13 PM)  OK I have head temp sensors on # 1 and 3 on a type 4 # 1 gives me readings at 180 after idle warm up 4- 5 min # 3 gives me 260 after a short ( 1/4 mile ) drive # 1 is the same, but # 3 is climbing towards 350 what can cause this? is this a tuning issue? can this be a timing issue? can this be a assembly issue? the factory sensor tells my fuel injection the the temps are as high as the gauge reads I'm just looking for all of the possibilities so I can start to run thru them since the temps. are so different i think i would first switch the wiring to from gauge #1 to #3 and visa versa. that way you can confirm possible false reading. mike |
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| roadster fan |
Jul 29 2008, 04:14 AM
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#3
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Project Frankenstein !!!!!!!! Group: Members Posts: 1,009 Joined: 24-November 05 From: Aptos, CA Member No.: 5,184 Region Association: Northern California |
The experts will certainly chime in here, but the #3 cylinder is gonna be the hottest because it is the farthest from the cool air source and it's air (along with #4's) are on the side of the engine with the oil cooler.
If one CHT is used it is place under the #3 sparkplug for this reason. The #3 valve seat is usually the one to fail due to the extra heat there. FWIW, I may be completely off base but that is my understanding. Jim |
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| Gint |
Jul 29 2008, 07:39 AM
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#4
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Mike Ginter Group: Admin Posts: 16,075 Joined: 26-December 02 From: Denver CO. Member No.: 20 Region Association: Rocky Mountains  |
(IMG:style_emoticons/default/agree.gif) #3 runs the hottest anyway. But I'm no expert. Just a cheap (IMG:style_emoticons/default/icon_bump.gif) and a note to George. How's that bumper coming? (IMG:style_emoticons/default/happy11.gif)
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| ericread |
Jul 29 2008, 11:01 AM
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#5
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The Viper Blue 914 Group: Members Posts: 2,177 Joined: 7-December 07 From: Irvine, CA (The OC) Member No.: 8,432 Region Association: Southern California |
QUOTE(orange914 @ Jul 28 2008, 07:58 PM) QUOTE(George H. @ Jul 28 2008, 06:13 PM) OK I have head temp sensors on # 1 and 3 on a type 4 # 1 gives me readings at 180 after idle warm up 4- 5 min # 3 gives me 260 after a short ( 1/4 mile ) drive # 1 is the same, but # 3 is climbing towards 350 since the temps. are so different i think i would first switch the wiring to from gauge #1 to #3 and visa versa. that way you can confirm possible false reading. mike (IMG:style_emoticons/default/agree.gif) Although Cylinder 3 is expected to be the hottest, it shouldn't be hotter by 90 degrees. Check the measuring tool first, then re-post your results. Eric Read |
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| tornik550 |
Jul 29 2008, 11:10 AM
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#6
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
Valve Lash Issue?
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| benalishhero |
Jul 29 2008, 05:30 PM
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#7
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Member Group: Members Posts: 313 Joined: 28-November 07 From: Portland, Maine Member No.: 8,384 Region Association: North East States |
pull a plug. could be lean.
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