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Bad idle


James
Does lots of head


Galant VR-4 org Post #: 1133993 posted 07/26/13 02:53 PM     Remind Me!  Send Private Message   Edit Post      
Bad idle started after I did my timing belt and friends. Idles like I have some nasty cams installed. I checked for boost leaks and didn't find any. I checked my timing and with the cams line up the crank is spot on. Hooked up the timing gun and got it to 5 degrees the best I could. With it being really bouncy it was hard to tell. I'm not sure what else to check. FIAV is blocked off. TPS is in spec and the ISC is good. Vac bounces between -8 and -12 at idle. Winding down in gear it's about -22. Boosts just fine at 20psi'ish.

If I blip the gas at idle the vac will drop to -17ish and come back to -8ish. Idle alternates around 700-900



1990 Summit White Galant GSX
Chipped EPROM ECU/2g maf/550cc injectors/3in exhaust /E316G/FMIC/Wally255/AeromotiveAFPR/lower shores MBC


Edited by James (07/26/13 02:54 PM)

Posts: 1322 | From: Port richey Florida | Member Since: 04/08/12 | IP: (68.200.64.80) | Report this post to a Moderator

turbowop
Hard Snarker
1051/2000



Galant VR-4 org Post #: 1133999 posted 07/26/13 03:09 PM     Remind Me!  Send Private Message   Edit Post      
When you remove the timing belt, the exhaust cam will retard a couple degrees due to spring pressure on the valves/camlobes. When reinstalling it, you have to make sure that the exhaust cam is advanced back into place. It's a very common issue for those first doing timing belts on these cars, and can create the exact issues you're describing. Are you absolutely sure that the cams are lined up correctly? Unless you're really seasoned at timing belt installs and what the sprockets look like when the belt is correctly timed, it's hard to spot.



-Mark

A face only a grocery shopper could love.
1051

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James
Does lots of head


Galant VR-4 org Post #: 1134005 posted 07/26/13 03:21 PM     Remind Me!  Send Private Message   Edit Post      
We actually had the tool to keep the cams in line when releasing the tension. They were lined up dead even (the marks) when we took
It off and lined up dead even when we put it bac on.



1990 Summit White Galant GSX
Chipped EPROM ECU/2g maf/550cc injectors/3in exhaust /E316G/FMIC/Wally255/AeromotiveAFPR/lower shores MBC

Posts: 1322 | From: Port richey Florida | Member Since: 04/08/12 | IP: (68.200.64.80) | Report this post to a Moderator

James
Does lots of head


Galant VR-4 org Post #: 1134010 posted 07/26/13 03:38 PM     Remind Me!  Send Private Message   Edit Post      
Don't get me wrong I 100% think its something timing related. I just don't see what it is when everything is lining up.



1990 Summit White Galant GSX
Chipped EPROM ECU/2g maf/550cc injectors/3in exhaust /E316G/FMIC/Wally255/AeromotiveAFPR/lower shores MBC

Posts: 1322 | From: Port richey Florida | Member Since: 04/08/12 | IP: (68.200.64.80) | Report this post to a Moderator

James
Does lots of head


Galant VR-4 org Post #: 1134014 posted 07/26/13 04:21 PM     Remind Me!  Send Private Message   Edit Post      
Something new. Out for a drive now and I put it in neutral. Idle goes down to 1.1k And bounces up to 1300 a few times before settling down to 900ish with the same symptoms as originally posted

Also seems the rpms are hanging between shifts



1990 Summit White Galant GSX
Chipped EPROM ECU/2g maf/550cc injectors/3in exhaust /E316G/FMIC/Wally255/AeromotiveAFPR/lower shores MBC


Edited by James (07/26/13 04:26 PM)

Posts: 1322 | From: Port richey Florida | Member Since: 04/08/12 | IP: (166.147.120.168) | Report this post to a Moderator

Steve885
Member
885/1000


Galant VR-4 org Post #: 1134023 posted 07/26/13 05:39 PM     Remind Me!  Send Private Message   Edit Post      
I hope you figure this out I'm having the exact same problem

Posts: 228 | From: Concord ca | Member Since: 12/07/12 | IP: (70.197.3.88) | Report this post to a Moderator

EHmotorsports
Capt Fabbin Stabbin
1865/2000


Galant VR-4 org Post #: 1134044 posted 07/26/13 09:55 PM     Remind Me!  Send Private Message   Edit Post      
I would go back and make sure the crank and cam marks line up. If they do I would verify your ignition timing.



click

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James
Does lots of head


Galant VR-4 org Post #: 1134078 posted 07/27/13 09:12 AM     Remind Me!  Send Private Message   Edit Post      
That's what I did yesterday prior to making this thread :/ but ill do it again tomorrow to triple check.



1990 Summit White Galant GSX
Chipped EPROM ECU/2g maf/550cc injectors/3in exhaust /E316G/FMIC/Wally255/AeromotiveAFPR/lower shores MBC

Posts: 1322 | From: Port richey Florida | Member Since: 04/08/12 | IP: (68.200.82.29) | Report this post to a Moderator

Steve885
Member
885/1000


Galant VR-4 org Post #: 1134107 posted 07/27/13 07:02 PM     Remind Me!  Send Private Message   Edit Post      
How do u verify your ignition timing ???

Posts: 228 | From: Concord ca | Member Since: 12/07/12 | IP: (76.103.219.37) | Report this post to a Moderator

rgeier11
sled driving mullet brain


Galant VR-4 org Post #: 1134109 posted 07/27/13 07:29 PM     Remind Me!  Send Private Message   Edit Post      
With a timing light.

Make sure the dowel pins are in the correct location on the cam gear while #1 is at TDC.



1992 GVR-4 #649/1000 SOLD
1998 3000GT VR4 1of19 in New Zealand Green
1992 TSI AWD

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James
Does lots of head


Galant VR-4 org Post #: 1134147 posted 07/28/13 09:44 AM     Remind Me!  Send Private Message   Edit Post      
Exhaust cam is Indeed off. Not sure how with how we had it set in place



1990 Summit White Galant GSX
Chipped EPROM ECU/2g maf/550cc injectors/3in exhaust /E316G/FMIC/Wally255/AeromotiveAFPR/lower shores MBC

Posts: 1322 | From: Port richey Florida | Member Since: 04/08/12 | IP: (68.200.64.80) | Report this post to a Moderator

James
Does lots of head


Galant VR-4 org Post #: 1134299 posted 07/29/13 03:12 PM     Remind Me!  Send Private Message   Edit Post      
Wow I'll take my lashings guys.

What actually happened is the timing was 180 degrees off.



1990 Summit White Galant GSX
Chipped EPROM ECU/2g maf/550cc injectors/3in exhaust /E316G/FMIC/Wally255/AeromotiveAFPR/lower shores MBC

Posts: 1322 | From: Port richey Florida | Member Since: 04/08/12 | IP: (166.147.123.23) | Report this post to a Moderator

marvinmadman
Senior Member
136/1000


Galant VR-4 org Post #: 1134323 posted 07/29/13 05:44 PM     Remind Me!  Send Private Message   Edit Post      
Is that possible?



1982/2000 sold
1263/2000 parts
136/1000 work n progress
08 ZX14
10 Ford Flex TT/AWD
05 Galant GTS

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James
Does lots of head


Galant VR-4 org Post #: 1134329 posted 07/29/13 06:26 PM     Remind Me!  Send Private Message   Edit Post   
It might have only been a tooth off the first time we did it weeks ago. When vi put it back together today I noticed everything still wasn't line up perfect. Turns out the dowel pins were facing south instead of north. After that correction it all lined up as it should. Idles perfect now.



1990 Summit White Galant GSX
Chipped EPROM ECU/2g maf/550cc injectors/3in exhaust /E316G/FMIC/Wally255/AeromotiveAFPR/lower shores MBC

Posts: 1322 | From: Port richey Florida | Member Since: 04/08/12 | IP: (166.147.123.33) | Report this post to a Moderator


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