Hey everyone...94 Mtx... Just changed the fuel pump and the sending unit as well as the fuel filter. When she has sat over night in the the morning it fires right up with no issues. When I drive it to work and then leave again after 20 30 minutes when it starts it fires up but runs rough like it's lacking fuel or something. After running for a few seconds and a few low rpm revs it smooths out. I don't know what the it could be. Fuel pressure regulator?... Any advice would help.. Thanks
94 Mtx Running rough
- Thread starter BS94SHO
- Start date
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sperold
Last to Know
Fuel injector leaking down.
Try running some injector cleaner through it.
Try running some injector cleaner through it.
the leaking injector will cause flooding and therefore a hard restart.
the injector usually leaks because the pintle does not close completely and that is usually because of "crud" buildup in the injector. injector cleaner will have a reasonable chance of cleaning that out and allowing the injector to close properly again. I have found using acetone (about 5 oz per tank) to be more effective than most injector cleaners, but you have to be really careful not to drip the acetone on any paint that you like because it will eat it up.
the injector usually leaks because the pintle does not close completely and that is usually because of "crud" buildup in the injector. injector cleaner will have a reasonable chance of cleaning that out and allowing the injector to close properly again. I have found using acetone (about 5 oz per tank) to be more effective than most injector cleaners, but you have to be really careful not to drip the acetone on any paint that you like because it will eat it up.
luigisho
SHO Member
There are lots of how to stuff posted about how to do it, but in a nutshell it is very simple. Just pay attention to spark plug firing order and which wire goes where and watch out for small vacuum hoses toward the back. They can get pinched between the intake and head without being able to see it and you can torque the whole thing down thinking you did everything correctly.
luigisho
SHO Member
http://web.archive.org/web/20061030213543/http://www.shophoenixproject.com/upper60k/upper60k.htm
Intake removal first half of the page
save it in your favorites somewhere. you'll need to use it again at some point
label or mark your hoses and stuff for reassembly
Intake removal first half of the page
save it in your favorites somewhere. you'll need to use it again at some point
label or mark your hoses and stuff for reassembly
luigisho
SHO Member
pretty much
luigisho
SHO Member
I would get the original agsp32pp plugs from shosource if available. Alot of people are running the iridium motorcrafts although the plug height is a tad longer. I wouldn't really bother with the fancy multiprong stuff. The splitfires were problematic, the e3's maybe not so bad but I haven't heard of any improvements either. There were threads about plug fitment but I forget which newer ones had the optimal height to seal at oem height so the wire boot sits perfectly.
Gotcha... Thanks for the info.....im just trying to get it running as perfect as possible...I already had the clutch replaced with the shosource TOB upgrade... New fuel pump and sending unit and fuel filter, rear main seal and bell housing seal...$1800 later...lol
luigisho
SHO Member
Yeah purchase price is usually just the beginning of the actual cost of getting to a reliable running order.
Yeah very true....I paid more than I should have but the car is basically show room condition... It does run really well but I've been around cars so long that I know when it not running exactly perfect....and it actually is my daily....lol....is there a trans drain plug for the 5 speed gearbox?
You can modify your tranny to add one. I drain my tranny through the fill hole and use a shop vacuum bottle set up and hose
http://wiki.wikisho.com/wiki/SHO_Transaxle_Drain_Plug_Installation
http://wiki.wikisho.com/wiki/SHO_Transaxle_Drain_Plug_Installation
When I did it in the car, I just took a plastic/paper bowl and drilled through the center of that and left it on the drill bit while I drilled the hole in the bottom of the trans. That way, I avoided getting the drill soaked in oil when I drilled through. I just drilled until it started to drain, let it drain and then completed the drilling.
The mtx uses atf for fluid.
Acetone is acetone, just buy whatever brand the hardware store happens to have. I pour the right amount into an old injector cleaner bottle (with a long, skinny neck) and then use that to pour it into the gas tank. That way I don't have to worry much about spilling it on the paint. But, I learned that I cannot leave the acetone in the injector cleaner bottle because it will eventually dissolve the bottle, so I always empty the little bottle when I use acetone in my tank.
The mtx uses atf for fluid.
Acetone is acetone, just buy whatever brand the hardware store happens to have. I pour the right amount into an old injector cleaner bottle (with a long, skinny neck) and then use that to pour it into the gas tank. That way I don't have to worry much about spilling it on the paint. But, I learned that I cannot leave the acetone in the injector cleaner bottle because it will eventually dissolve the bottle, so I always empty the little bottle when I use acetone in my tank.
luigisho
SHO Member
If you don't want to drill and install a drain plug, I would go to a shop and have them drain and fill with MERCON ATF. They can pump the old stuff out easier on a lift if you don't mind paying for the effort. Make sure they put in correct atf and not gear oil
http://www.shoforum.com/index.php?threads/5-spd-fluid-change-what-fluid.131007/#post-1439982
http://www.shoforum.com/index.php?threads/5-spd-fluid-change-what-fluid.131007/#post-1439982
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