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Old 11-18-2005, 12:57 PM   #1
Scooby Newbie
Member#: 90202
Join Date: Jun 2005
Default 2 Bad Sensors, Hard Starting

I have a 1995 Subaru Impresza 2.2 litre 4WD which has had its check engine light on for some time. The only real noticeably symptom was an occasional hard start. This was completely random, but it seemed that during the hot months it was more frequent. I finally took it into the shop and it turns out its a fairly easy fix. There are 2 bad sensors; the coolant temp sensor and the oil pressure sensor. My mechanic is fixing both for around $60, labor and parts. I am also getting a tune up to clean out the throttle body, etc. My question is actually related to the hard start however. Does anyone know if either of those sensors were causing the hard starting? One other thing that happened rarely was surging. If I was at a light idiling, it would jump forward at times and the rpms would also leap. I didn't know that this would be caused my the coolant temp or oil pressure sensors. I was convinced it was the MAF, but thats fine.

I just hope this solves the problem. Any help or comments are appreciated!
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Old 11-18-2005, 01:05 PM   #2
Trust no one
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
02 WRX
15 WRX/05 GTO


The coolant temp sensor was most likely the cause of your problems. When it fails or goes out of range the ECU does not get the proper information it needs to set the fuel mixture for starting and running. The result is symptoms like you have been experiencing.
The oil pressure sensor is only there to operate the warning light or gauge on the dash and would not have any effect on how the car runs. If it's being replaced it was either leaking or not reading correctly.
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Old 11-18-2005, 02:57 PM   #3
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Member#: 90202
Join Date: Jun 2005

Thats what I was thinking, I just couldn't find any articles on it. Thanks for your help. you've eased my mind.
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Old 11-23-2005, 11:49 AM   #4
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Member#: 90202
Join Date: Jun 2005

Sometimes my mechanic and I don't understand eachother..sigh. He has a very thick, indian accent and he talks really fast. He only fixed the oil pressure sensor, and "cleaned up" the coolant temp sensor. When I picked up the car he said the coolant sensor WILL need to be replaced. I was like, weren't you fixing that today? Well whatever. I bought one at checker, but my chilton's manual shows no pictures of where it is. Can anyone tell me where it is located? I have a handle on what to do, I just need to know where I can get at it.
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Old 11-23-2005, 05:28 PM   #5
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Member#: 89234
Join Date: Jun 2005

Under the intake manifold on the passanger side. You will probably have to remove some vacuum lines to get to it. You will see that it has a brown connector on it. You need a deep 19mm?? socket to get it out. And when you do pull it out, coolant will run out so have the new one handy.
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Old 11-25-2005, 05:09 PM   #6
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Member#: 9861
Join Date: Sep 2001
Chapter/Region: RMIC
Location: Colorado Springs, CO
1999 2.35 RS-T w/NOS
Hybrid Rally Blue Pearl


It's located in the coolant crossover pipe, under the intake manifold.
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