Any Suggestions

Reply Subscribe

Thread Tools

Search this Thread

Apr 26, 2006 | 12:47 PM

300-6

Thread Starter

Senior User

Joined: Dec 2005

Posts: 119

Likes: 0

From: Newbern, Tn

Any Suggestions

Okay, I am finishing a motor transplant, i started with an 87 4.9 ans I am replacing with a an 88 4.9l. The motor is sitting happing in it's new home, but i have few problems. When I start it up, it runs real rough shakes and sounds like it has miss to it. The exhaust fumes smell like it's running RICH. I have went back and checked to make sure everything is pluged in. I am thinking that I may have some vacum lines crossed somewhere, I followed the diagram in the manual but I am still unsure. If some one has some pics on their engine compartment they would be great. Any Ideas
87 F150 4x4
4sp 4.9l
Thanks

Apr 26, 2006 | 10:32 PM

4.9inline6

Elder User

Joined: Oct 2005

Posts: 514

Likes: 0

is it timed correctly? distributor in there correctly?
chris

Apr 26, 2006 | 10:34 PM

beatupford

Senior User

Joined: Feb 2005

Posts: 150

Likes: 0

From: Timmins,Ontario,Canada

If its efi your talking about, could be over 1000 reasons. I guess i tell you what everones telling me, pull the codes. Somethings might be effecting manifold vaccum, so your map sensors out of range? vacuum check valves not working, Throttle position sensor? EVP sensor? Bad compression? Check voltage reference to your your sensors. As for vaccum lines, could be a leak. If you do that it might pinpoint the problem down. If you like danger blow a little propane gas (very little so it can dissapate quickly) on all vaccum connections and gaskets on a COLD engine. Its very effective, and your rpms will go way up if you have a leak.

Apr 27, 2006 | 08:11 AM

300-6

Thread Starter

Senior User

Joined: Dec 2005

Posts: 119

Likes: 0

From: Newbern, Tn

I am going to check the timing tonight. The thing that worries me is the strong amount of exhaust gas, the cloud is real thick it's hard to describe it's a real, dark thick cloud. I am going to check the temp sender;s tonight, and the timing.
Maybe I will figure it out

Apr 27, 2006 | 11:37 AM

81fordf-250

Senior User

Joined: Mar 2006

Posts: 409

Likes: 0

From: Chrisney Indiana

there are so many

There are so many possible causes to this it isn't even funny. Electric fuel injection can have one little thing wrong and mess the whole thing up. It could be the egr valve the maf senser or map senser bad injectors or bad o2 senser. The best way to find the cause is with a computer.

Apr 27, 2006 | 11:50 AM

300-6

Thread Starter

Senior User

Joined: Dec 2005

Posts: 119

Likes: 0

From: Newbern, Tn

I am about ready to just tear everything of the top, and put a carb on. I am sure all the smog garbage isn't helping things.

Apr 27, 2006 | 02:40 PM

81fordf-250

Senior User

Joined: Mar 2006

Posts: 409

Likes: 0

From: Chrisney Indiana

if u want

The efi will get better gas mileage than a carb

Top 10 Fords at 2026 Carlisle Ford Nationals

Joe Kucinski

3 Best / 3 Worst Parts of Modern Ford Ownership

Brett Foote

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

Pouria Savadkouei

Every 2026 Ford Engine Explained

Brett Foote

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

Apr 27, 2006 | 08:24 PM

optikal illushun

Postmaster

Joined: Mar 2002

Posts: 3,545

Likes: 4

From: Coal Region

sounds like she may have a vacuum leak. u can always try going around the engine and spray come carb cleaner (or the like) to see if it clear up at all.

i would also check fuel pressue and check engine vacuum with a guage. use this site: http://www.users.bigpond.com/ergoff/vac1.htm for references and how to test. (there is two pages).

good luck.

Apr 28, 2006 | 08:15 AM

#10

300-6

Thread Starter

Senior User

Joined: Dec 2005

Posts: 119

Likes: 0

From: Newbern, Tn

Well I finally figured it out last night, It was combo of two things. 1. The map sensor was partially unpluged. 2. The collant sensor on the back of the block was unhooked. but the main thing is it's running now. Now all i need is new exhaust.

Thanks everyone's help