EGT issue

by Craig Trout in 912 / 914 Technical Questions 4 years ago

Have an interesting problem I've been wrestling with. EGTs are good at RPM. When I throttle back as in downwind #1 EGT drops out the bottem. I get an EGT out of range on the EFIS. Add power EGT comes back up.

When I pull the plugs and inspect #s 3 & 4 are white. #1 is black (as in fuel fouled) and #2 is black but not as bad as #1.

CHTs on #1 & #3 are also a bit low in relation to #2 & #4

The only common item I can see to #1 & #2 is the trigger coils. I have already replaced the IGN coil for #1/2 Bottem and all plugwires and boots that tested out of range with no real change.

Also both carbs have been to Lockwood for 600hr overhaul.

Any thoughts?

Re: EGT issue

by Garrett Wysocki » 4 years ago

Garrett Wysocki

1 572 1.45k

The plugs are normal if the engine was idleing before shutdown. How many hours on the EGT's they have a life 300 to 500 hours some go longer. Replace all as a set otherwise you get mismatches on the readings.

Report
Re: EGT issue

by Craig Trout » 4 years ago

Craig Trout

4 3 4

Replaced the EGT less than 25 hrs ago because of the same problem before I replaced the IGN coil & wires. ACFT has about 130hrs. Eng has about 1300 hrs w/ a ZipperKit installed about 80 hrs ago.

Shut down was right after landing and then the plug check.

Report
Re: EGT issue

by Garrett Wysocki » 4 years ago

Garrett Wysocki

1 572 1.45k

Don't let it idle at all, after a ground run of 5000rpm shut it down immediately then check plugs. Have you weighed the floats and checked carburetor balance?

Report
Re: EGT issue

by Craig Trout » 4 years ago

Craig Trout

4 3 4

Float weight checked at condition insp. - Good and I assume Lockwood checked them when I sent them in for overhaul.

Also reset the carb balance.

Report
Re: EGT issue

by Garrett Wysocki » 4 years ago

Garrett Wysocki

1 572 1.45k

Does make full power? Is the mag check during runup within specs? Was the coil bad that you replaced? Did you swap the EGT probes and make sure it is not a problem with your instrumentation?

Report

You do not have permissions to reply to this topic.

Title	Category	Replies
New SB related to various engine issues	912 / 914 Technical Questions	6
Strange EGT and CHT	912 / 914 Technical Questions	10
Rv-12iS High EGT and Coolant temps	912iS Technical Questions	3
Rough running / high EGT	912iS Technical Questions	13
Rough running / high EGT	912iS Technical Questions	0

EGT issue

Recent Videos

Safety First!

Prize Giveaway!

Log In/Out

Login