How do you adjust the IAC?

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Originally Posted by neev_nav

but the two screens that came with your rebuild kit are new screens for the injectors.

Do they go in the holes on the side of the injectors or are they for a different style of injector and go on the tip? I tried to get them into the hole on the side of the injector, but I felt like I was going to have to push harder than I felt was safe. But it was late, so that might have something to do with it, and I only tried for a few seconds.

Originally Posted by neev_nav

And as far as the braided lines go, yours is the only one I've ever seen with those.

I'll double check and count how many I see at the pull apart when I go, but I'm sure everyone around my year had the braided lines. I like them because they flex and are easy to work with, and last alot longer.

[ChevyTech]

The part in the fuel return line that has the highest probability of being a problem is flexible line by the TBI with the braided covering on it. It is also a part that has been affected recently by the installation of a TBI spacer on your truck. The odds of a steel line getting plugged with rust are significantly lower then the possibility of a rubber hose delaminating or deteriorating internally causing a restriction. Don’t overlook the hose by the fuel tank sending unit.

To answer your question: Yes there is rubber in the flexible return line.

The newer TBI trucks the flexible part of the line is in the transmission bell housing area. I don’t even now how many years it has been since I have seen under the hood of a 1989 truck. In my area the average age of the vehicle on the road here is probably 4 years old. Most 1989’s have rusted away and been junked years ago.

[neev_nav]

Originally Posted by get me on the road

Do they go in the holes on the side of the injectors or are they for a different style of injector and go on the tip? I tried to get them into the hole on the side of the injector, but I felt like I was going to have to push harder than I felt was safe. But it was late, so that might have something to do with it, and I only tried for a few seconds.



I'll double check and count how many I see at the pull apart when I go, but I'm sure everyone around my year had the braided lines. I like them because they flex and are easy to work with, and last alot longer.

Man, how I wish my lines were braided. They would be SO much easier to deal with!

The screens go on the tips of the injectors. If you take the pod apart, and take the injectors out, there should be screens on the ends. They're not visible while the injectors are in the pods.

[ChevyTech]

Re: Screens in G.M.O.T.R's photo

The screens at the bottom are much larger then the ones in his photo.

I think the sreens he showed in the photo go in the side of the injector.

My I don't know was more of a I don't have time now to look if those are to big for the side which they looked bit to big at the time. SORRY! It is getting warmer outside in Minnesota and I just am not going to spend as much time on the computer. I will try to answer posts where I think I can give the most help with the least time, but I will not be here as much.

Here are some photos for comparison.

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Me and my dad got to talking about it, hes been out of town this past week, and you know how dads do 80% of the time , come up with good ideas out of those years of experience, he said put it all back together, start it with the pressure gauge on and take off the gas cap and see if the pressure goes to spec, makes sense in theory. My truck has the evap canister, I think thats what its called, in the engine compartment, behind the driver side head light. If the gas cap is bad, and this goes to all following this thread, just take it in stride because the simple things are sometimes over looked. I cut the steel braided line at the crimp, where the solid steel line gets attached, and cut off about 1"-1 1/2" and nothing looked wrong. I'll post a pic of the line that I cut off so you can know whats inside it. I put some JB weld in that hole on the fuel reg housing, and I'm waiting till it cures, about another 5 hours, and I'll put the aftermarket spring in it and put it on the TB and see what happens. I'm also going to get a new IAC and put it on before I start it. So cross your fingers and I'll let you know what happens.

Edit:
Below is what is inside of the braided steel line. The 2 metal pieces are the crimp, I cut on both sides and popped them off with a flathead. The piece of metal that you see in the blue outer, black inner, piece of hard but flexible plastic fuel line, is just there to hold it open for a better look inside. The flexible fuel line just slid out of the braided steel sleeve.

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Well no luck. I tried testing it with the gas cap off and it still went to 15-16 psi. But I was able to regulate the fuel pressure thru my tester, and at 11.5-13 psi seems to be the best as far as taking the engine up to 2500-3000 rpms and having the pressure stay the same. 10 psi and below would drop to around 6 psi when I revved the engine. I was able to eliminate the return line as the source of high pressure (see 1st pic) I hooked that up to the TB and ran it into a gallon jug, and I'm 100% sure there is no clog in the TB return line port. With that JB weld in that hole on the fuel meter body, the pressure will drop to 0 after about 20-30 seconds and before it would drop to zero as soon as the pump quit running.The second pic is how I fixxed the return line after cutting it. I got a 1/4" double sided barb hose splicer and some 1/4" fuel line and a few 1/4" clamps. I'm pretty sure I can build an adjustable regulator and I will, if it works, post pics, parts list and instructions for those who would like to build one. I just dont know what to make of the high pressure, I know it has to be the regulator or the fuel meter body or both. Anymore suggestions would be appreciated.

[ChevyTech]

When you test the fuel pressure, where do you T into the system?

But I was able to regulate the fuel pressure thru my tester…

Did you lower the pressure by opening the bleed off valve on the pressure tester?

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Originally Posted by ChevyTech

When you test the fuel pressure, where do you T into the system?

I take the feed line out of the TB and put my tester between the feed line and the TB

Originally Posted by ChevyTech

Did you lower the pressure by opening the bleed off valve on the pressure tester?

See pics below, I used that black shut off valve to regulate the psi.

[ChevyTech]

I take the feed line out of the TB and put my tester between the feed line and the TB

Good!
Then we know the pressure is actually that high AT the TBI unit.

I have an idea that I will send you a PM about.

[neev_nav]

Has it always been like this? Is it possible that the wrong fuel pump is installed?

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Originally Posted by neev_nav

Has it always been like this? Is it possible that the wrong fuel pump is installed?

I never tested the fuel pressure until about a week ago, so I dont know if it was high before I tuned up the TB and added the spacer. As best as I can remember, the exhuast did not have that eyes and nose stingy smell when I bought it last summer. I noticed it after I tuned up the TB and added the spacer. I've had the truck running in the garage before I did the work and could not smell the exhuast like I could after I did the work. The exhaust is also hot and will make your hand so hot that you have to pull it away from the end of the tail pipe after a few seconds. The truck has never, since I've had it, had a converter on it. The ethanol mixture thats in the gas may have something to do with it, I know my MPG has dropped about 4 mpgs since the cold weather moved in. This is the first full month that I've had the spacer on and I'm getting ready to figure out my mpgs, and will let you know what I find. ChevyTech has another test for me to do, but I cant do it till later this week or next week. I will post what I find, when I find it.

[neev_nav]

Awesome. I'm really intrigued by this and want you to figure it out!

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Originally Posted by get me on the road

This is the first full month that I've had the spacer on and I'm getting ready to figure out my mpgs, and will let you know what I find.

With the TB spacer I gained 0.04 mpg, but I have not got the high psi straight, so that could be affecting it. Like I said since the cold weather moved in my mpg dropped 4 . I do not know if something went wrong, while the temp was dropping, with the truck that added to the decreased mpg. The real results will be when I get the psi fixxed and we start getting 100% gas. I'm working on the high psi now, and will let you know what I find. neev nav, I was at the pull apart Friday and counted 4 trucks with the steel braided line, I didnt check every truck there so there could have been more. I'm guessing maybe 2 years of those trucks had the steel braided line, the doors on the trucks were missing or smashed shut and the engines had been pulled and fan shrouds removed so I couldnt find the year.

[neev_nav]

Man, I'm going to go hit a pull a part and get those fuel lines! Mine are such a pain in the arse. Any luck with getting the pressure down?

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Not yet. I'm waiting for Chevytech to log on and answer my PM. I'm thinking that my truck may have a high flow/psi pump in it. The fuel pump fuse holder has a 20 amp fuse in it, and I think thats too big. I cant find a book that tells me what its suppose to be. I may take the regulator back to NAPA and exchange it if they'll let me, and hope that I've gotten 2 bad regs from 2 different stores.

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Heres an update: I checked my oil and it was about 1-1 1/2 quarts low and I never had to add oil between changes. I checked my coolant and found it was black and had small black particles floating in it. When I put on the TB spacer on I had to take a bolt out that held the bracket that held the throttle, tv and cruise cables, and I replaced that bolt with another, longer, bolt. That bolt also held down the driver rear of the intake and there is a coolant passage at that corner. Out of lazyness I didnt find the tourqe spec and tourqe the new bolt to spec. So I believe it started sucking 'oily air' from the oil gally, I believe its called, and mixed with the coolant. Anyways I changed the intake gaskets, which I believe were factory and in pretty bad shape (see pics). So if I was sucking some coolant and oily air into the heads and the spark plugs were trying to ignite that, then that could be a result of poor mpg. As far as the fuel milage and the spacer I'll let you know at the beginning of June what I found for May. Now for the high fuel pressure, I cut all the hose open on the tester and found no restrictions. Next month I'll buy new hoses and put them on and hope I missed something in the old lines. I'll let you know what I find. If thats not the problem then when I get the spare $ I'll replace the fuel pump. The fun doesent stop there, I checked my coolant again after I did the intake gaskets and found it was getting black again and had more black particles in it. I'm hoping that is stuff that was in the bottom of the block and stuff that was caked to radiator and all the other little crevices, and not a blown head gasket. I flushed it pretty good when I did the gaskets, but ChevyTech said to take at least one plug out of the block and see how much crud is in there. I will also flush it with the plug out. Be advised anyone who is thinking about pulling there block plugs I cant stress this enough so I'll put it in caps, HIT IT WITH ALOT OF PENETRATING OIL AND LET IT SOAK FOR A WHILE, YOU DO NOT WANT TO SNAP ANYTHING OFF IN THE BLOCK, that just creates a sorta big job. I plan to soak mine drive it that day, soak it again and let it sit over night, then do it again the next day, then remove it the next morning. Just for fun I threw in 1 pic from the last fishing trip, laugh if you want because thier bluegill, but they fight good, taste good and are fun to catch on a jig. Down here they get pretty big. I put part of my hand in there so you could sorta see how big they are. If you look at the bottom of my middle finger,near the knuckle, you can see where a 1/4'' drill bit went into it, almost all the way thru.

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Heres an update: I've done a major tune-up and put a new O2 sensor on. I still have not bought new hoses for my fuel pressure tester yet, so I dont know what the psi is yet. I was gone for 2 weeks, and when I got home I went out to my truck so I could go to the store. When I started it the fuel gauge on the dash pegged all the way full. I'm thinking, great, something else to fix, because when I left it only had about an 1/8th of a tank. Come to find out my dad took it to the gas station and filled it up , while I was gone. He thinks he put around 26 gallons in it. Anyways heres some pics, the 1 that has the old plugs has 1 of the new champion truck plugs off to the side. I think they made a difference in power, as the truck feels much stronger now. The engine is starting to look nice and I havent even cleaned it or the engine compartment yet. I also plan to paint the engine compartment too. That old rotor looks in pretty good shape, huh.

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Heres a few pics of the eagle and her baby that live at the camp site my where my cousin puts his camper. Those talons look pretty nasty.