Low compression numbers, no smoke
05-03-10, 10:53 AM
#1
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Low compression numbers, no smoke
So, i took my car to maztech yesterday. It's been idling uneven, i got the CEL fixed (Was a radiator temp sensor i believe), and now my low coolant light has came up a couple times in the past 2 days (Once turning around a corner and the other sitting at a slightly sloped intersection) but the coolant was filled up when i had the work done.
Engine has 75k original miles.
Compression test numbers came out as around 5.2 consistent on the rear rotor and 6.2 consistent on the front.
The car runs fine and always starts right up, pulls hard, and does not smoke at all.
I used a converter and that comes out to 88 psi front rotor, 72 rear rotor. Do these numbers seem correct? Stuck seal? Or do i actually have a bad coolant seal?
Car is a 1991 GTU
Engine has 75k original miles.
Compression test numbers came out as around 5.2 consistent on the rear rotor and 6.2 consistent on the front.
The car runs fine and always starts right up, pulls hard, and does not smoke at all.
I used a converter and that comes out to 88 psi front rotor, 72 rear rotor. Do these numbers seem correct? Stuck seal? Or do i actually have a bad coolant seal?
Car is a 1991 GTU
Last edited by Vortes; 05-03-10 at 10:58 AM.
05-03-10, 11:20 AM
#2
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The coolant may not have been topped correctly, or there was air trapped in the system. Top the coolant again, make sure the bleed screw on the radiator is open until coolant flows from there; close it; then top up to the cap.
If the coolant sensor comes on again, have the coolant checked for the presence of exhaust gases (chemical check, any radiator shop can do it if you bring in a sample of the coolant taken from your radiator.)
If exhaust gases are present, you have a blown coolant seal.
72 psi on the rear rotor is low, 85 is supposed to be the minimum.
If the coolant sensor comes on again, have the coolant checked for the presence of exhaust gases (chemical check, any radiator shop can do it if you bring in a sample of the coolant taken from your radiator.)
If exhaust gases are present, you have a blown coolant seal.
72 psi on the rear rotor is low, 85 is supposed to be the minimum.
05-03-10, 01:00 PM
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Did the champagne test, only large bubbles came out when i revved it, rarely any other bubbles. This is with the car warmed up.
Did the champagne test, only large bubbles came out when i revved it, rarely any other bubbles. This is with the car warmed up.
05-04-10, 01:07 PM
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