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[Mk2] [Turbo] MR2 turbo rebuild

 
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ringslayer




Joined: 05 Apr 2016
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PostPosted: Sat Dec 22, 2018 4:36 pm    Post subject: [Mk2] [Turbo] MR2 turbo rebuild Reply with quote Reply with quote including images

Hi Guys,

just rebuilt my gen3 3sgte, but idles bad, it misfires on idle, although I get no codes from the ECU, checked for all connectors to be attached, etc. but can't seem to find it.

I also did a compression test, giving 9 bar or 135 psi on all four cylinders, but with the throttle body wide open it gives 3 bar more, almost 175 psi. Did someone else have a similar experience? IACV blocked?

Thanks!
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abovetherim




Joined: 16 Feb 2011
Posts: 587
Location: Leicester
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1991 Toyota MR2 Mk2 NA Rev1

PostPosted: Sun Dec 30, 2018 6:34 pm    Post subject: Reply with quote Reply with quote including images

First off you should be WOT when compression testing so 175 seems about right and if it is within 10 or so between cylinders then all good.

Start with simple things like vac leaks. Plug leads in right order. Coolant bled properly. TPS set correctly. All injector plugs on well. Vac lines in correct places with any valves the right way around? Fuel pressure good?

Is the ignition timing close to where it needs to be?

Are you positive the cam timing is correct, timing marks at 1 tdc line up with the crank pulley at 0 Deg?
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pbmr2




Joined: 18 Jun 2010
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PostPosted: Thu Jan 03, 2019 2:51 pm    Post subject: Reply with quote Reply with quote including images

first bet would be an air leak. anything from a cracked idle valve to duff intake gasket to injector O-rings etc.

is the vacuum piping at the rear of the intake all correctly plumbed?

mef sensor can be a git when they go, best search on how to test them as not had the pleasure yet.

is the vacuum hose for the FPR still good?
The one way valve for the brake booster hose still working?

good luck
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ringslayer




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PostPosted: Sat Feb 16, 2019 4:47 pm    Post subject: Reply with quote Reply with quote including images

ok, so further testing was done, but still couldn't get it right.

Compression is as follows after 5-6 cranks:

155, 160,160, 160 PSI

I cleaned out the IACV, which made my idle a lot better, but engine is shaking still slightly. Popping seems to have stopped

Pressure tested for boost leaks/ vacuum leaks all eliminated.

very small leak at downpipe, just in front of o2 sensor, could that be the cause?
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markstevieandmads




Joined: 05 Aug 2013
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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Sat Feb 16, 2019 6:30 pm    Post subject: Reply with quote Reply with quote including images

my bet is timing is out
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ringslayer




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PostPosted: Tue Feb 19, 2019 10:31 am    Post subject: Reply with quote Reply with quote including images

cam timing or ignition timing?
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androo007




Joined: 03 Mar 2014
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1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Tue Feb 19, 2019 12:28 pm    Post subject: Reply with quote Reply with quote including images

cam belt timing i'd have thought. check it hasnt slipped a tooth
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ringslayer




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PostPosted: Tue Feb 19, 2019 4:33 pm    Post subject: Reply with quote Reply with quote including images

I'll check it again this week. taking the rocker cover off to be 100% sure
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Ryan S
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1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Tue Feb 19, 2019 5:40 pm    Post subject: Reply with quote Reply with quote including images

Check ignition timing with a timing light first. It’s easy to check and easy to adjust. Before you start taking off the rocker cover. Could just be a few degrees out.
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ringslayer




Joined: 05 Apr 2016
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PostPosted: Wed Feb 20, 2019 1:38 pm    Post subject: Reply with quote Reply with quote including images

checked everything

cam timing is dead on, as well as ignition timing

also pulled the ECU and checked for leaking capacitors, but looks as clean as a whistle

I'm out of ideas... Cylinder leakage test was also less than 20%, so that's ok.

Any other ideas?
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Ryan S
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1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Wed Feb 20, 2019 3:07 pm    Post subject: Reply with quote Reply with quote including images

HT leads on in the right order? You have compression and ignition and timing. That only leaves fuelling.
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ringslayer




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PostPosted: Wed Feb 20, 2019 6:58 pm    Post subject: Reply with quote Reply with quote including images

ok, I'll check the fuel pressure regulator. Something else to test or known to go wrong?
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ringslayer




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PostPosted: Wed Feb 20, 2019 7:00 pm    Post subject: Reply with quote Reply with quote including images

HT leads on the right order, all new ignition components;

I also seam to have a very small leak at the dp and turbo gasket, could this cause such issues? I will be changing the gasket this week...
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Ryan S
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Joined: 10 Dec 2005
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Location: Bonnie Dundee
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1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Wed Feb 20, 2019 8:06 pm    Post subject: Reply with quote Reply with quote including images

ringslayer wrote:
HT leads on the right order, all new ignition components;

I also seam to have a very small leak at the dp and turbo gasket, could this cause such issues? I will be changing the gasket this week...


na i doubt that would cause this issue. Deffo worth checking fuel pressure. Did you replace the king lead? I know you said you've replaced everything but I've seen this be overlooked in the past on here and more often than not it has been the culprit. make sure the coil is earthed properly too. Possibly check the coil wires for continuity.
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ringslayer




Joined: 05 Apr 2016
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PostPosted: Thu Feb 21, 2019 11:10 am    Post subject: Reply with quote Reply with quote including images

king lead was also replaced, I did notice the car running a lot better with the TPS sensor unplugged, however it then wouldn't idle below 1200 rpm. I did check the TPS a while ago and it was withing BGB specs...

pulling the plugs one by one made difference, so it's running on 4 cyl, albeit rough.
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