Please help me!!!

jared_blown5.0 · May 31, 2006

Ok so here is what is goin on. I have a 94 mustang gt. I just did a h/c/i swap and cant seem to get her runing right. First off it doesnt idle right, i cleaned the iac and the tb, and the maf sensor. It will surge like crazy and a lot of times it will just die out, and for reference it is an automatic. I pulled the plugs and they arent blackthey are a nice brown. fuel pressure is at 43 psi with vacumn off. Also i reset the computer after the mods.
.
-Also i am not burning coolant but the overflow jug keps filling up, and coming out the overflow and then i need to put more in. I did put a 160 degree thermostat in it. Do you think that has anything to do with it? I pressurized the system and it held at 16 psi and no leaks.

Please help me guys. I just kinda wanna kick it right about now lol

fordtech28 · May 31, 2006

what h/c/i combo did you use what injectors are you using 43 pounds of fuel pressure is a little much you should be around 40 pounds at what degree did you see your timing at and the biggest problem you have right now is that a 160 degree thermostat makes our cars run like crap its too cold it doesn't make the engine run to optimal temperature which is between 180-190 degrees for it to heat for the sensors to register readings right and thats probably one of the biggest problems you have right now also check for vacuum leaks

jared_blown5.0 · May 31, 2006

I have trick flow r series manifold, afr 185 cc heads, and a custom cam with .555, and .565 lift. Ok i will turn down my fuel pressure, and get a 180 degree thermostat. Also it ran perfectly with a really lumpy idle when it was 30-40 degrees out now i cant even get a lumpy idle out of it. Any ideas? thanks in advance.

Pokageek · May 31, 2006

555 lift wow, that thing is gonna fly. If you ask me, I could not get mine running right without a professional tune. I did a MAF and fuel inj change which threw the whole thing off and I didn't know enough/have the time with the tweecer to program that. I needed it done fast and the tuner corrected it all.

jared_blown5.0 · May 31, 2006

anyone else come on i need help...? lol

fordtech28 · May 31, 2006

put your timing around 12 degrees and probably get it tune since the 94-95 computer is sensitive about cams after that it will really wake up

mytight95 · May 31, 2006

i would put it on stock timing settings 10*, change the thermostat, if you have to idle it up with the idle set screw a little(not the one that opens the tb blade) so to ensure it is getting enough airflow at idle.... even if it idles high a little while it should allow the computer to adjust to some of the changes...

also may want to check the ect sensor

jason

mo_dingo · May 31, 2006

I used the throttle body blade set screw to up my idle from 700 to 900, and that helped it a lot.
Scott

JOEGTS · May 31, 2006

I just went through the same problems after the HCI swap and I didn't go near as radical as you. I called JMS chips and they burnt me a chip and cured my idle problems.

jared_blown5.0 · Jun 1, 2006

thanks guys i am goin to have a custom chip burned in about a month when my 347 stroker goes in. But i will try to set the timing and throw the 180degree thermosat in and see if it helps.

Please help me!!!

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