Nightmare confirmed.... !!! Options???
Thread Starter
|
Senior User
Joined: Oct 2006
Posts: 223
Likes: 0
From: south cali
Nightmare confirmed.... !!! Options???
Hello all
I have been having cold start smoke/miss (smells terrible) for a few months. I figured it was an injector that had gone south since it did start making a funny noise. So i ordered a set of Reman single shots w/hydra chip Injectors and installed them, only to still have the cold start smoke/miss. I checked the usual....( boost leaks, fuel leaks, all sensors check ok according to AE, No excessive blow by, harnesses, and VC gaskets ohm around 3.2 - 3.4 at the 42 pin connector, fuel pressure at 65psi @idle, hpop 500+ @idle, does not consume excessive oil, degas bottle is clean, does not consume coolant.
Went ahead and did a compression test... these are my results.
2. 360
4. 250
6. 365
8. 360
1. 365
3. 370
5. 375
7. 365
Would it be possible it is a valve rather than rings....?? If so how do i check for that...??? (leak down test??)
Finally, what are my options besides a short block from ford??? Is the RiffRaff rebuild kit the way to go???
I have an engine out of an OBS that i could use. Are the blocks interchangeable???
Thanks
I have been having cold start smoke/miss (smells terrible) for a few months. I figured it was an injector that had gone south since it did start making a funny noise. So i ordered a set of Reman single shots w/hydra chip Injectors and installed them, only to still have the cold start smoke/miss. I checked the usual....( boost leaks, fuel leaks, all sensors check ok according to AE, No excessive blow by, harnesses, and VC gaskets ohm around 3.2 - 3.4 at the 42 pin connector, fuel pressure at 65psi @idle, hpop 500+ @idle, does not consume excessive oil, degas bottle is clean, does not consume coolant.
Went ahead and did a compression test... these are my results.
2. 360
4. 250
6. 365
8. 360
1. 365
3. 370
5. 375
7. 365
Would it be possible it is a valve rather than rings....?? If so how do i check for that...??? (leak down test??)
Finally, what are my options besides a short block from ford??? Is the RiffRaff rebuild kit the way to go???
I have an engine out of an OBS that i could use. Are the blocks interchangeable???
Thanks
Senior User
Joined: Feb 2004
Posts: 249
Likes: 1
If there's no excessive blowby then it would almost certainly be valve related. Did you put the copper washer in for the injector on that cyl? Somone else can probably chime in about how to test for it. If the obs heads are compatible you could get a fresh valve job on those heads and have minimal down time. How many miles does your SD have?
Thread Starter
|
Senior User
Joined: Oct 2006
Posts: 223
Likes: 0
From: south cali
ah, gotcha.
Do you know if the OBS engine blocks are interchangeable with the new 7.3's ????
I guess i can swap my parts to the early block if i have to, while i rebuild my block....
Do you know if the OBS engine blocks are interchangeable with the new 7.3's ????
I guess i can swap my parts to the early block if i have to, while i rebuild my block....
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
The blocks are interchangeable, but there are a few things that need to be swapped.
It's all discussed in this thread. Click here
It's all discussed in this thread. Click here
Trending Topics
Thread Starter
|
Senior User
Joined: Oct 2006
Posts: 223
Likes: 0
From: south cali
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Postmaster
Joined: Dec 2010
Posts: 2,951
Likes: 4
From: Gary,Indiana
Like it was already said since you don't have blow by than I would say it is a valve issue. Personally I think it would be easier to pull the heads and do a valve job. But once you get the heads pulled you can check to make sure the valve issue did not involve valve smacking the priston. And if that is the case I would say go to a back up engine until you can go through and rebuild that one.
Postmaster
Joined: Apr 2012
Posts: 2,613
Likes: 8
From: North Georgia
If you can... have it on a stand to pull the heads.
1. It will be much more manageable.
2. It will already be out if you discover cylinder/piston issues.
3. Fighting with the weight of one of these heads is bad enough while on a stand... let alone in the truck.
Since you are already going as far as pulling heads...
I would pull the oilpan and give everything a good look.
Maybe welded jets?
Doing the changeover with an obs motor is gravy.
I think the fuel pump lobe port took a 7/8 freeze plug.
Just in case the diagnosis is bad...
Take lots of pictures!
1. It will be much more manageable.
2. It will already be out if you discover cylinder/piston issues.
3. Fighting with the weight of one of these heads is bad enough while on a stand... let alone in the truck.
Since you are already going as far as pulling heads...
I would pull the oilpan and give everything a good look.
Maybe welded jets?
Doing the changeover with an obs motor is gravy.
I think the fuel pump lobe port took a 7/8 freeze plug.
Just in case the diagnosis is bad...
Take lots of pictures!
Senior User
Joined: Jul 2011
Posts: 176
Likes: 0
From: Bristol Tn
Drop a little oil in the cylinder and re check compression. If the number goes up the rings are bad. If it dosen't change its a valve issue.
Laughing Gas
Joined: Aug 2010
Posts: 1,098
Likes: 6
From: Ventura co.
Not too much oil or you could hydro lock the motor..
Thread Starter
|
Senior User
Joined: Oct 2006
Posts: 223
Likes: 0
From: south cali
Thanks guys. I will be doing a leak down test and add oil to the piston as advised, and go from there.
Truck runs great after it warms up.So hopefully it is a valve issue.
I will report back with my findings.
Again..thanks
Truck runs great after it warms up.So hopefully it is a valve issue.
I will report back with my findings.
Again..thanks
Thread
Thread Starter
Forum
Replies
Last Post
mattdoc88
6.0L Power Stroke Diesel
30
Jul 24, 2019 04:42 PM
adamax21
1994.5 - 1997 7.3L Power Stroke Diesel
12
Feb 13, 2014 12:32 AM
spcw1234
1999 - 2003 7.3L Power Stroke Diesel
18
Jun 12, 2011 07:56 PM
350ford4x4
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
3
Aug 29, 2006 08:57 PM