Missing problem needed fixed b-4 cruise in.

[1992MustangDW]

Ok I can start my car cold and drive it up the road, when I get about a 1/4 up the road or car starts to warm up it starts missing.

Its a really bad miss. If I let off the gas it will idle, If I hit the gas to try to make it move it will just start to die and pop really bad. Kinda like the car is bucking.

I checked the plugs, they look good. I cleaned the distributer cap. New wires. new fuel pump. Could it be the timing? I dont know I need some help asap!

The car is speed density.

[1992MustangDW]

Bump, any ideas?

[fordfan]

TFI module or maybe the coil?

[1992MustangDW]

How hard are the TFI modules to change?

[facemelter71]

My 86 did that on the way back from Taco bell a couple years ago.I swapped out the Distributor for one from Advanced.I think it was from advanced.Cleared it right up.
The Module and the PIP in the dizzy are known for going bad.

[1992MustangDW]

ok thanks fellas I have another distributer I can try real quick.

[1992MustangDW]

I changed the TFI and still popping. checked timing. 11 deg.

It is lean really lean. There is popping coming out my intake. Tore the intake down and im going to put the top half back on a little slower this time.

Any other ideas?

[facemelter71]

So you just changed the module.Some times the PIP (profile Ignition Pickup) goes bad.

[1992MustangDW]

no changed the whole distributer

[facemelter71]

Coil,is it newer?

[NXcoupe]

What work did you do to the car before this problem began?

[Stangman]

I think he just put an engine in it :lol:

Gotta love the break-in blues

[1992MustangDW]

yes I did lol. But it ran great. I had just put my upper and lower on AGAIN lol. So I think my lower gasket is shot. I am out side now putting a new one on, without the cork front and rears. Im using the rubber ones instead. Coil Is brand new. Everything is new on the car except the short block.

[Stangman]

I am leaning toward o2 sensors... only because Steves LX chased that demon forever and it turned out after putting brand new o2's in it, he found out that he had a bad o2 sensor harness...

Unhook your o2 sensor harness and see if it goes away... The car will run in open loop and shouldnt act retarded if the harness or o2's are bad.

[1992MustangDW]

ok When I hooked up the fuel pressure tester I had 20 psi when I turned key forward.
When I started it the fuel pressure was at 35/36.
When I unplugged the vaccum on fuel pressure reg it was at 40.
when I blimped the throttle the fuel pressure dropped to about 30.
When I shut it off the pressure didnt stay there it had only about 15 pounds after about 3 minutes.

Can anyone tell me if this is right?

[Stangman]

Sounds about right... although the bleed off seems a little too quick... although that wouldnt be the first fox I've seen with 3-5 minute bleed off. I'm used to my sn95... that thing takes a half hour to bleed.

Did you try your o2 sensor harness yet?

[1992MustangDW]

I dont think its there lol

[plated]

air meter swap out with another and let us know

[1992MustangDW]

The one on the right side of motor on the hard lines?

[duststang]

I had same issue on my 93 vert. I changed the dist., plugs, coil, and wires. That didnt work so long story short I cleaned the EGR valve really good and it started running great. Might be worth a try?

[1992MustangDW]

o Shit wait a second. all this happend after I took off my egr valve and used a delete plate. thats when it all started.

[1992MustangDW]

would taking the egr off and not telling the computer cause it t run like crap when it warms up

[stang5slow]

o shit, is that what it was? the egr plate? i just ordered one lol i hope not bec because thats 10 bucks i could keep an use to go to the track an watch lol

[1992MustangDW]

im putting old one back on tomorrow I will let you know.

[SN95N/A]

good luck man...

[stang5slow]

update???

[1992MustangDW]

Still missing wasnt the egr stuff. Im going to switch over to carb.

[stang5slow]

o ok, im lost, its like trying to find a needle in a hay stack bud, i hope you can figure it out or good luck with the carb.

[stang5slow]

hey do you still have smog acc's???

[1992MustangDW]

Nope I dont have none of that crap. took out everything I dont need. ran fine after that I just dont get what happend.

[Stangman]

Did you get my voicemail yesterday?

[1992MustangDW]

Yes, I was going to call back but it was late. I havnt ever had o2 sensors on it and it ran really good b-4. Plus I dont have an 02 harness to try one.

[Stangman]

So I heard Steve helped you out? Still going carb'd?

[1992MustangDW]

lol Um it was fixed for about 20 minutes then started acting up again I bumped the timing up and it isnt missing as bad. Still runing lean like the computer is in limp mode

[Stangman]

Might take a few key cycles for the ECU to relearn...

When I put 24# injectors in my '94 without swapping the MAF it ran like absolute crap for about 2 days... now I can start the car and it will actually Idle... Give it time, don't give up on it yet...

Better yet... convert it to Mass Air! :bigthumb

[CNTLOSE]

I had the same problem on an '88 once. Only difference is once it warmed up it would also get the RPM's up to about 2k and stay. After changing every sensor, removing, adding, and cleaning, I took the salt and pepper wiring harness apart behind the intake. I cleaned up the connecting pins and holes and BOOM! it was fixed.

Just a thought...

[1992MustangDW]

I will check that out. Thanks for everyones input. I should change it to mass air.

[stang5slow]

lol well i got my egr plate, (had to drill new hole in it) and my car doesn't act up, so couldnt be that

[Stangman]

lol well i got my egr plate, (had to drill new hole in it) and my car doesn't act up, so couldnt be that

Yes but is your car Mass Air?

[stang5slow]

ya its mass air

[1992MustangDW]

im done with the damn thing anyways, I picked up a new ride the other day.

[stang5slow]

sweet? hows it run?

[1992MustangDW]

I got a 240 sx Im putting the swap in it. sr20..

Im done trying to fix the mustang im done with it.