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Beardy89
- Got muddy boots
- Posts: 49
- Joined: Sun May 10, 2015 8:58 pm
- Location: Bristol
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by Beardy89 » Sun May 31, 2015 2:01 pm
Ok so finally got round to buying a compression tester and doing a compression test. Results below.
Measured in PSI.
WIDE open throttle.
After some further testing it appears as though my budget compression tester underreads by around 60psi.
Meaning my results are:
1 = 160psi
2 = 160psi
3 = 150psi
4 = 160psi
From what i've read this is ok for an engine with around 80,000miles on it.
Where to go next?
TPS?
Exhaust leak?
Lambda?
ECU?
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Rhinoman
- Suzuki Guru
- Posts: 1034
- Joined: Tue Mar 26, 2013 5:42 pm
- Location: Brinkworth
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Contact:
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by Rhinoman » Sun May 31, 2015 8:44 pm
A leak from the exhaust manifold will throw the O2 sensor reading off and cause it to run rich, that is well worth investigating, a new O2 sensor would be a good investment too.
How did you determine that your compression tester was out by 60psi?
2006 Jimny JLX+ 1.3 VVT
2000 Vitara 4u2 - Calmini 3+3, 33" MTs, 5:83 R&Ps, winch bumper, remapped ECU.
1986 Suzuki SJ413K - G16 conversion
1984 Suzuki SJ410 - Blitz
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Beardy89
- Got muddy boots
- Posts: 49
- Joined: Sun May 10, 2015 8:58 pm
- Location: Bristol
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by Beardy89 » Sun May 31, 2015 9:23 pm
Rhinoman wrote:A leak from the exhaust manifold will throw the O2 sensor reading off and cause it to run rich, that is well worth investigating, a new O2 sensor would be a good investment too.
How did you determine that your compression tester was out by 60psi?
Rhino. I used my air compressor with a high quality pressure gauge. Connected both gauges to the compressor and ran it up through various pressures.
I will order a new lambda sensor. Would a leak from the exhaust manifold cause issues like this?
Last edited by
Beardy89 on Mon Jun 01, 2015 9:12 am, edited 1 time in total.
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donkeychomp
- I spend far too much time on here
- Posts: 3583
- Joined: Thu Aug 18, 2011 3:49 pm
- Location: Shepperton, Middx
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by donkeychomp » Sun May 31, 2015 10:31 pm
160 is low but ok, my 410 engine is 175 on all 4. And it's done a lot more miles!
If it ticks over...leave it
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Beardy89
- Got muddy boots
- Posts: 49
- Joined: Sun May 10, 2015 8:58 pm
- Location: Bristol
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by Beardy89 » Tue Jun 02, 2015 10:54 pm
Changed lambda tonight. Seemed to make a slight improvement.
Think the next step is to seal the exhaust leak from manifold. And to peform the TPS test and adjustment.
After that I am out of ideas.
