993 CEL SAI repair - what to look for
07-29-2016, 01:17 PM
#16
Racer
Thread Starter
How pricey can one expect a top-end rebuild to be?
07-29-2016, 01:42 PM
#17
Nordschleife Master
This is true. A top end is looming in my future. I'm just waiting for the oil consumption to get to a point where it matters. Right now, it's consuming oil, but very little. Also, in my service records there was never a record of SAI work being done during the life of the car. Once I drilled mine out which was the first time in 16 years, there has been no return of the SAI CEL..is it going to clog again? Probably. But my plan is to be on-top of it ~ change the Check Valve every 15K miles. And if the light comes on before my top-end plan, drill out the ports again. 
07-29-2016, 11:34 PM
#18
solvents poured in from the top are another method, but if one passage is blocked, the solvent will seek the path of least resistance and flow through an alternate branch, if it is less restrictive.
This is why one would block off the bottom end of the ports, to allow the seafoam or some such chemical to work on the clogged passages.
I would strongly recommend going through the admin post at the top of the 993 forum; Recap of the SAI circuit.
This is why one would block off the bottom end of the ports, to allow the seafoam or some such chemical to work on the clogged passages.
I would strongly recommend going through the admin post at the top of the 993 forum; Recap of the SAI circuit.
07-30-2016, 11:30 AM
#19
I am looking at a '96 993 that has the CEL SAI issue. It is in a dealers inventory and they are in the process of fixing it. My question is what should I look for when I see the car to make sure the repairs were done correctly? Visually, there is probably not much I can see, but maybe paperwork detailing the work that was done?
07-30-2016, 12:27 PM
#20
Banned
Have a Pro Measure as stated earlierin Thread
27,000 + Miles after drilling - No issues - No CEL.
Car had a SAI / CEL History in Ca. with previous owner.
Dealer used Solution to Clean 2x prior to my drilling.
Engine was not "Fully Blocked" - Fortunately so Drilling has worked for me.
At the same time I Changed Resonance Flappe Gasket etc
Now I use the half Litre Approach to Adding Oil - Measuring from Bottom of Dip Stick.
27-28000 Miles since Drillin the Freakin SAI Ports and she pulls hard.
2000 + Miles per Litre Consumption using V Twin 20W-50 @ 112,000 mls
Just Pulled Plugs on Cyl 3, 5 and 6 - All burining Beige in colour.
It will be Years b 4 I consider a Rebuild Necessary although I do have a 3.8 itch.
Engine Production Consistency may be the unknown factor here.
Have a Pro Measure for peace of mind
:>)
Happy - Goin for a cruise!
Cheers
TJ
Car had a SAI / CEL History in Ca. with previous owner.
Dealer used Solution to Clean 2x prior to my drilling.
Engine was not "Fully Blocked" - Fortunately so Drilling has worked for me.
At the same time I Changed Resonance Flappe Gasket etc
Now I use the half Litre Approach to Adding Oil - Measuring from Bottom of Dip Stick.
27-28000 Miles since Drillin the Freakin SAI Ports and she pulls hard.
2000 + Miles per Litre Consumption using V Twin 20W-50 @ 112,000 mls
Just Pulled Plugs on Cyl 3, 5 and 6 - All burining Beige in colour.
It will be Years b 4 I consider a Rebuild Necessary although I do have a 3.8 itch.
Engine Production Consistency may be the unknown factor here.
Have a Pro Measure for peace of mind
:>)
Happy - Goin for a cruise!
Cheers
TJ
Last edited by TJ993; 07-30-2016 at 12:35 PM. Reason: addl info
07-30-2016, 12:40 PM
#21
Race Director
08-01-2016, 12:52 AM
#23
Nordschleife Master
I meant the 1411 and 0410 are the Secondary Air Injection CELs, and those are turned on because the O2 sensors are not getting enough O2, due to clogged port. Yes, when he blower turns one, and blows air into the system the O2 sensor before the cat, is supposed to read a certain level.
08-01-2016, 07:13 PM
#25
Rennlist Member
I think that the SAI valve needs to be replaced often. The valve is a check valve that prevents exhaust gases from flowing the wrong direction. Last I replaced mine after 30,000 miles, the valve flowed both directions. I think that back flow is what may lead to clogging.
08-03-2016, 01:23 AM
#26
I think that the SAI valve needs to be replaced often. The valve is a check valve that prevents exhaust gases from flowing the wrong direction. Last I replaced mine after 30,000 miles, the valve flowed both directions. I think that back flow is what may lead to clogging.
I agree wholeheartedly that the SAI check valve is one of the contributing causes to clogged SAI ports.
Also, when the engine oil is overfilled, it gets sucked into the SAI system... Add a non-functioning check valve and hot exhaust gasses and the oil bake into the SAI passages, begins...
I think Andy, pulled and replaced his, and recommended no longer than 15k mi. per valve.
Last edited by nine9six; 12-09-2017 at 11:28 PM.
09-28-2016, 12:54 PM
#28
Rennlist Member
12-09-2017, 11:45 PM
#30
Drifting
