P1151 - 2000 Ex v8

[Kidd7]

I got her apart; cleaned / rebuilt the injectors. I didn't find any that were sticky or leaky, this doesn't necessarily surprise me since it's been such an intermittent problem. Hopefully cleaning & exercising the injectors makes a difference. I did make sure I kept the injectors on the same side.

I did the burb test as noted above before dismantling, none of the spark plugs were wet.

I'm attaching a picture of one of the intake ports. Most were coated in black soot, this one is a brownish color. Not sure what that means.

Removing the intake is a pain with all the hoses attached.

Lastly, is there a source for the coolant pipes that lay on top of the lower intake from the water pump to the heater hoses and hoses to the intake? I've got some rust there and am unable to find the part listed on rockauto.

The plan is to put her back together and test drive tonight. I'll follow up.

 

[410Fortune]

You are talking about the heater hose manifold on the passenger side of the intake? That part is not available
You can refurbish yours or bypass it altogether

The 5.0 upper intake definitely takes some patience to install with all the plumbing, but once you do it a time or two it get easier

It helps if you break it all the way down to just the intake, no elbow no throttle body… much easier to install that way… but not required by any means. I will drop the intake onto its gaskets with all hoses and lines in place and the rearmost tall bolt must be in the hole before you install the intake on the engine. I use masking tape to hold the bolt up so it’s doesn’t screw ip your gasket or alignment

Nice work thus far!
If this doesn’t fix your misfire issue maybe time for a compression test… thinking you may have a bad valve seal
Or seat

 

[Turdle]

Ford coolant crossover pipe

NEW UNBOXED OEM 96-97 Ford Explorer 302 5.0L V8 Coolant Crossover Tube + Sensor | eBay

SENSOR # F5AF-12A648-AA. New out of box part. from storage with hundreds of other bulk parts in one pallet. All our parts are (NEW OTHER) unless otherwise specified. They may have been in storage anywhere from 1-30 years.

www.ebay.com

 

[Kidd7]

Thanks Turdle. Mine has outputs to the upper intake, it doesn't look like this one has that.

 

[Turdle]

They are there. You can either use those, or, loop it back to itself to bypass upper coolant flow

Nipples you are looking for are pointing down in pics, it's upside down.

That is the correct pipe, but, you may need to use your coolant sensor. The included one may not work with 99-01.

 

[Kidd7]

It helps if you break it all the way down to just the intake, no elbow no throttle body… much easier to install that way… but not required by any means. I will drop the intake onto its gaskets with all hoses and lines in place and the rearmost tall bolt must be in the hole before you install the intake on the engine. I use masking tape to hold the bolt up so it’s doesn’t screw ip your gasket or alignment

I did take the throttle body off and had to finagle that rear most screw. Thanks for the install tips. We'll see what kind of progress I can make tonight.

 

[Turdle]

Use a split chunk of hose about 3/4" long to hold rear upper intake bolt up. Slip split hose over bolt.

 

[Kidd7]

She's back together, ran great on the test drive, both O2 were switching and the fuel trims were near 0.

I'm going to order that coolant pipe to have on hand. Thanks for the help, I'll continue to monitor.

 

[Kidd7]

Update: still running strong. Sounds like I had a flakey injector. As I stated above I cleaned / rebuilt all the injectors, none were leaky or stuck. I did make sure I exercised them and not just a quick test. I did not pay attention to which cylinder they were originally in, but I did keep bank1 & bank2 separate so if the same injector became flakey again it will still be on bank2.

I received the coolant pipe last night. Instead of nipple for the coolant lines to the upper intake the 2 pipes are simple connected together with a metal loop. Just wanting to confirm the coolant flow to the upper intake is not necessary.

 

[Turdle]

I experimented both ways with the coolant to upper hoses and saw no difference in economy, or cooling.
The previous versions of that pipe had a removable hose loop there.

 

[410Fortune]

Not needed I bypass those two hoses every time… one less thing to worry about
Leave the loop!

 

[410Fortune]

Disclaimer: If you live in Minnesota or the like where ice storms blow sideways all winter and the humidity is 400% below freezing you may want to leave them so your throttle body and intake don’t ice over

I’ve Lived at 9000’ in Colorado and now in the Pacific Northwest and my non pre warmed 5.0 intake plenum has never given me issues