Fresh 1.9L Build , engine shuddering , rev hunting , won't hold steady RPM
03-22-2021, 04:45 AM
#1
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Join Date: Aug 2020
Posts: 14
Total Cats: 0
Fresh 1.9L Build , engine shuddering , rev hunting , won't hold steady RPM
Hello,
I have finally fired up my fresh 1.9L build!
Managed to get it half running in the rubbish basemap provided to me from the builder of the ECU (Extra EFI UK)
Then I had a remote tune booked last Friday.....I know it's not ideal in comparison to getting it RR tuned but he was going to make me a safe map with conservative timing and fuel just so I could drive about and run the engine in no boost etc
AN hour into the remote tune he requested if I could hold the RPMs at 2k while he adjusts parts of the map and I then found I couldn't....
When trying to hold 2K the car shudders and drops 200rpm then goes away
2000rpm , 1800 , 2000, 1800 and so on...
Everytime it "shudders" AFR goes to 17-18 also
From a bone cold start for the first 30-45 seconds I can hold the revs and it holds them perfectly
Ive leak down tested the engine and had 5% leak down on all cylinders
I have had the car running and shot brake cleaner at the injector seals to see if the revs increased (no change in RPM)
I just want to upload the map/a few logs on here just to see if you can see anything that I've missed
When looking at the logs on MLV I can't see anything ECU wise other than AFR that is changing when the car shudders/runs lean I just want to be able to rule out an ECU setting or something interfering before I rip everything apart
Hope you guys can help
Spec
MK1 1.8 Block
Stock crank
Maspeeding Conrods
Supertech pistons
Wiseco Rings
ACL Bearings
ARP mains
ARP Headstuds
Boundary Pump
OEM Headgasket
BP4W Head (new seals, guides , skimmed , pressure tested
Stock cams
stiffer valve springs
Squaretop UK inlet
MK2 throttle body and IACV
Stock rail
Bosch EV14 640cc injectors
Coolant reroute
GfB developments Toyota COP kit
kraken manifold
GT2860RS
Kraken 3" downpipe
Kraken 3" system
Mtech cooler kit
Extra EFI PNPAEM 30-4900 Failsafe WidebandGM IATAEM 3port MAC valve
I have finally fired up my fresh 1.9L build!
Managed to get it half running in the rubbish basemap provided to me from the builder of the ECU (Extra EFI UK)
Then I had a remote tune booked last Friday.....I know it's not ideal in comparison to getting it RR tuned but he was going to make me a safe map with conservative timing and fuel just so I could drive about and run the engine in no boost etc
AN hour into the remote tune he requested if I could hold the RPMs at 2k while he adjusts parts of the map and I then found I couldn't....
When trying to hold 2K the car shudders and drops 200rpm then goes away
2000rpm , 1800 , 2000, 1800 and so on...
Everytime it "shudders" AFR goes to 17-18 also
From a bone cold start for the first 30-45 seconds I can hold the revs and it holds them perfectly
Ive leak down tested the engine and had 5% leak down on all cylinders
I have had the car running and shot brake cleaner at the injector seals to see if the revs increased (no change in RPM)
I just want to upload the map/a few logs on here just to see if you can see anything that I've missed
When looking at the logs on MLV I can't see anything ECU wise other than AFR that is changing when the car shudders/runs lean I just want to be able to rule out an ECU setting or something interfering before I rip everything apart
Hope you guys can help
Spec
MK1 1.8 Block
Stock crank
Maspeeding Conrods
Supertech pistons
Wiseco Rings
ACL Bearings
ARP mains
ARP Headstuds
Boundary Pump
OEM Headgasket
BP4W Head (new seals, guides , skimmed , pressure tested
Stock cams
stiffer valve springs
Squaretop UK inlet
MK2 throttle body and IACV
Stock rail
Bosch EV14 640cc injectors
Coolant reroute
GfB developments Toyota COP kit
kraken manifold
GT2860RS
Kraken 3" downpipe
Kraken 3" system
Mtech cooler kit
Extra EFI PNPAEM 30-4900 Failsafe WidebandGM IATAEM 3port MAC valve
Last edited by Lee Shah; 03-22-2021 at 01:27 PM.
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03-22-2021, 10:07 AM
#4
Newb
Thread Starter
Join Date: Aug 2020
Posts: 14
Total Cats: 0
Thanks for the fast replies!
Luckily I have lots of spare parts (I have another working parts car that used to be my daily)
I removed the COPs setup and went back to OEM coil and leads and problem still persists
Swapped out the injectors for some standard maroon ones
Still happening
I've ordered all 3 tyres of injector seal (top hat to rail , injector to top hat , and the bottom cushions for the inlet)
Maybe it's sucking in air into the injector and not spraying?
Luckily I have lots of spare parts (I have another working parts car that used to be my daily)
I removed the COPs setup and went back to OEM coil and leads and problem still persists
Swapped out the injectors for some standard maroon ones
Still happening
I've ordered all 3 tyres of injector seal (top hat to rail , injector to top hat , and the bottom cushions for the inlet)
Maybe it's sucking in air into the injector and not spraying?
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03-22-2021, 04:29 PM
#14
Newb
Thread Starter
Join Date: Aug 2020
Posts: 14
Total Cats: 0
Here are the unfinished tune and log attached
you can see at beginning of log when cold its holds revs and afr doesnt spike
once warm it starts acting up
i tried turning EGO off and made no change
i gapped plugs down to .030 still no change
here is a video of it running to give you idea
Many thanks in advance
you can see at beginning of log when cold its holds revs and afr doesnt spike
once warm it starts acting up
i tried turning EGO off and made no change
i gapped plugs down to .030 still no change
here is a video of it running to give you idea
Many thanks in advance
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03-22-2021, 06:54 PM
#15
I'm Miserable!
Join Date: Mar 2020
Posts: 164
Total Cats: 4
I cant view the logs, but are you running closed loop or open loop idle? How about your idle VE settings. It sounds like a tune issues bc when it's warming up it has warm up enrichment that can be making it run decent, but once that ends it's based off your idle settings. I would run open loop idle for now just to get it running ok and then change to closed loop once you can tune more.
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03-23-2021, 02:45 AM
#16
Newb
Thread Starter
Join Date: Aug 2020
Posts: 14
Total Cats: 0
I cant view the logs, but are you running closed loop or open loop idle? How about your idle VE settings. It sounds like a tune issues bc when it's warming up it has warm up enrichment that can be making it run decent, but once that ends it's based off your idle settings. I would run open loop idle for now just to get it running ok and then change to closed loop once you can tune more.
I wanted to rule out any issues with that so currently the valve is switched off
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03-23-2021, 03:44 AM
#17
Newb
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Join Date: Aug 2020
Posts: 14
Total Cats: 0
I cant view the logs, but are you running closed loop or open loop idle? How about your idle VE settings. It sounds like a tune issues bc when it's warming up it has warm up enrichment that can be making it run decent, but once that ends it's based off your idle settings. I would run open loop idle for now just to get it running ok and then change to closed loop once you can tune more.
I wanted to rule out any issues with that so currently the valve is switched off
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03-23-2021, 11:04 AM
#18
Cpt. Slow
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Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,270
Total Cats: 1,157
Select your entire fuel table and multiply by 1.15, see if that helps. If it’s running ok when cold, the extra fuel from warm up enrichments may be all you need. 1.15 will give you 15% everywhere. It’ll run rich where it’s currently ok, but it’s enough fuel where if I’m right, it should run better.
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