A recent problem with a rough idle and a 1211 code finally prompted me to tackle my other recurring 1211 problems.

The rough idle was caused by a stuck ipr valve. It would start with the valve disconnected.

After I fixed that, I still had the 1211 code when oil was hot and asking for higher power levels such as freeway towing. Here is what I found:

#1 On a hunch, I pulled the edge filter and found a pump spring behind it. I sent the pump in to get rebuilt, but it didn't solve the problem.

#2 I used a scanner and determined that I had a HPO leak. It was difficult to find because the oil had to be hot. I found injector #5 leaking by the top o-ring. I pulled it and put a new o-ring on it. After purging the air for 100 miles or so, I still hadn't solved the problem.

#3 Now oil was leaking around injector #1. I replaced the o-rings on all 8 injectors. 100 miles...problem not solved.

#4 Oil leaking around injector #5 again. I put two of the metal o-ring backers on and forced the injector home. 100 miles...problem not solved.

#5 Oil leaking around injector #1 again. I put on two backers. 100 miles... problem not solved.

#6 Oil leaking around injector #3. I'm seeing a pattern here and remember that this head was off of my last motor that had similar problems. I double backered all injectors in that head. 100 miles...problem not solved.

#7 After monkeying around a long time, I got injector #6 to puke oil out the spout with all injectors disconnected and cranking the engine. Sent it in to get rebuilt, and put an AD in there for the meanwhile. (it has AA 160's). after 100 miles, problem not solved.

#8 ...Injector #8 leaking out the spout. I got the 160cc back from the rebuilder and put it in the #8 hole ( with the AD still in the #6 hole). After 100 miles...looks good. Today I hauled my backhoe another 40 miles back from the jobsite at 80 mph on the freeway...Golden!!! I'll send the second 160cc in tomorrow, put it back in and be done...I hope.

I don't use smilies very often, but I think most of them apply here especially since all of these issues could only be found while the oil was at peak temperature and it would only leak from one issue at a time.
:pca1 ::bat :

 

Just out of curiosity, you say you have 160cc AA's.. Who built them?

 

Why do you ask?

 

usually a p1211 code is caused by an IPR, but you say you replaced it along with cleaning the edge filter and rebuilding the pump. so that pretty much rules that half of it out.

by chance could you get a reading out of your low pressure oil pump? either mechanical gauge or scan tool? With the motor hot at operating temp, have you checked the HPOP reservior? It should be within 1" of the top.

the only other reason a p1211 code comes up is a leak in the HPO system. (which you've found)
I will say I've never seen this issue occur because of injectors doing what they're doing to you here, but if having them gone through again is helping, hell I say send em all in!

 

Well it sounds like your having injector issues and I'm curious who built the injectors to 160cc and how come you didn't just send them back to them for work... Did they have a warranty? Or am I reading your first post wrong?

After rereading, it sounds like you just sent two AA's in to get rebuilt? Are you meaning to say stock AA's or are they built to 160cc?

 

They are 160cc stage 1's built out of AA's. They are well out of warranty. The builder suspects dirty oil and that is probable considering the highly educational blunder I made. The original (highly respected) builder is doing the rebuilding. the first is back in the vehicle, the second is being sent in tomorrow. I'm not doing all eight because I don't want to pay for that right now and I am hoping to upgrade to hybrids the next time I have trouble. I'm thinking this dirty oil episode has been concluded and no more should fail due to the same problem. I have changed the oil like twenty times since then. I made sure there wasn't a third bad injector before I send in the second or I would have opted to do all eight.

 

Ahh, I understand now. Well hopefully that's all it is, just a few injectors...

 

I really thought the more interesting part here was using two o-ring backers. Has anyone had a similar issue or tried my solution? comments?

 

I have never heard of this but could it be caused by to much HPO at idle and maybe its bypassing the injector orings?

 

I suspect that that head which is from a ford reman had the injecor holes honed for some reason.