87 5.0 coupe with issues

873Stang · Dec 20, 2006

sooooo lol, well i have a 1987 stang 5.0 ho 5speed ex chp car.

and so first issue is my blinkers don't work, they work when they want to which is hardly what could cause this?

also my heater is hooked up and i dont get hot air im thinking heater control valve??

my check engine light comes on with key on engine off but key on engine on it doesn't and i had my o2's disconnected and i would think it would of came on? disconnected the iac still didnt come on? its running rich too?

and i was also wondering if any one knew the speaker size
for the coupe?

rear
door
and dash?

all help and ideas are greatly apreciated thx

Trefty · Dec 20, 2006

873Stang said:
my check engine light comes on with key on engine off but key on engine on it doesn't

Your check engine light is supposed to come on when you turn the key to accessory. If it stays light when you have the engine running, then you have a code.

sunil6784 · Dec 20, 2006

blinkers sounds like the multifunction switch.

for the speaker size...check crutchfield.com

sunil6784 · Dec 20, 2006

oh and any coolant loss or anything ? does the engine get up to operating temperature ?

873Stang · Dec 21, 2006

sunil6784 said:
oh and any coolant loss or anything ? does the engine get up to operating temperature ?

no coolant lost but loss of oil and i just replaced the rear main seal too

HISSIN50 · Dec 21, 2006

If the blinkers started going haywire after doing the heatercore (I'm not sure if you did it recently), get with Sgarlic. He chased an issue like that and found one wire that had been disturbed during the heatercore R/R that was the culprit, IIRC.

Good luck.

smr · Dec 21, 2006

were your O2 sensors hooke dup wen car was running rich? or disconnected?

vulcan95 · Dec 21, 2006

on ssp cars there is no door speakers just one of the trade off's

873Stang · Dec 21, 2006

smr said:
were your O2 sensors hooke dup wen car was running rich? or disconnected?

runs rich when connected!

873Stang · Dec 21, 2006

vulcan95 said:
on ssp cars there is no door speakers just one of the trade off's

lol well my car does, even saids on the title and reg its prior police. maybe the guy who had it before me replaced the door panels and added speakers

Dachipsta · Dec 21, 2006

FWIW, I have an 87 Gt and I was losing about a quart of oil every 2-3 weeks. Turns out when I replaced the intake, the gasket in the middle on the backside of the lower had almost completely fallen inward and was losing it all back there. Kind hard to see with everything assembled but I noted a bunch of grime all over the top of the bellhousing. I'm glad I was upgrading the intake cuz it would have been aweful depressing to go to all the work of pulling it to fix that stupid leak and still wind up with my ****ty old intake when it all was done.

No heat issue maybe the damper door that allows heat to pass from the core into the hvac system. Maybe a bad acuator or disconnected vac. line. If the heater core is in the coolant circuit, there is no valve so thats about all it could be unless its all stopped up with crud. If the engine is getting hot, check the two hoses in and out of the core. If they are both hot then you got flow. If one is hot and one isnt, then its not flowing...

Dachipsta · Dec 21, 2006

6X8's and 5X7's for the rear speakers, 5 1/4 in the doors and 3.5 in the dash.

Blinkers could be in the multifunction switch as mentioned. They also funnel thru the hazard switch up by the gauges above the rear defroster switch. The wires like to pull out of the harness so if anyone had the dash housing off and pulled too hard on the plugs taking them apart, that could be what is up there....

873Stang · Dec 23, 2006

Dachipsta said:
FWIW, I have an 87 Gt and I was losing about a quart of oil every 2-3 weeks. Turns out when I replaced the intake, the gasket in the middle on the backside of the lower had almost completely fallen inward and was losing it all back there. Kind hard to see with everything assembled but I noted a bunch of grime all over the top of the bellhousing. I'm glad I was upgrading the intake cuz it would have been aweful depressing to go to all the work of pulling it to fix that stupid leak and still wind up with my ****ty old intake when it all was done.

No heat issue maybe the damper door that allows heat to pass from the core into the hvac system. Maybe a bad acuator or disconnected vac. line. If the heater core is in the coolant circuit, there is no valve so thats about all it could be unless its all stopped up with crud. If the engine is getting hot, check the two hoses in and out of the core. If they are both hot then you got flow. If one is hot and one isnt, then its not flowing...

dude i love you man! lol you were right about the oil! and im 99.9% sure your right about the switch! you rock! the heater im still trying to figure out! both hoses are hot and when its on the a/c compressor will cycle it turns on the off then on and so forth.

Darkwriter77 · Dec 23, 2006

As far as your heater, it's likely the HVAC blend door not opening. Either you've got a vacuum line going to it that's split, cracked, disconnected, or otherwise leaking. With the car running, crawl around the passenger foot area under the dash and listen carefully for a hissing sound, and see if you can trace it to its source. If not there, do the same under the hood and listen close for a hissing. Only other things I can think it would be is a bad vacuum actuator (but those hardly ever just fail outright, really) or the HVAC controls are broken or otherwise unhooked somehow (maybe if someone was installing/removing a stereo and got sloppy about it, might've damaged something).

jrichker · Dec 23, 2006

Try this for your heater control problems.

Diagram courtesy of Tmoss & Stang&2birds

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring http://www.veryuseful.com/mustang/tech/engine/

http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

Dachipsta · Dec 23, 2006

Glad it helped out some. As far as the compressor cycling on and off while you control is set for heat, the compressor should only run when in mix and defrost....I think. I know it runs in defrost but not sure about mix. I know its not supposed to run in heat tho. Regardless, you should still be able to get hot air no matter where you have the controls set. It sounds like the damper isnt opening for some reason. That is a very good diagram for the vacuum routing as I just learned something from it myself. According to it, there is no actuator for the heater core bypass door. Its cable driven and not opened or closed by vacuum. Damn, thats good to know. I havent had mine apart yet but will soon cuz my heater core is a leaker and coming out soon. That makes things easier for you then. Just track down the cable running to the door and make sure its working. If thats all good and the door is opening and closing, you are having an issue with the core itself.

Guud Luck......

873Stang · Dec 24, 2006

so did the heater core pretty simple! it kinda works blow warm air so think i might go to a hotter thermastat i have a 180 high flow in it.

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