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86 starts then dies nightmare :)


87Jassic
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i have an 86 conquest that occasionally starts and then two seconds later dies. im guessing the ecu presets let it start but when the ecu switches over to the actual sensor readings its not seeing what it wants to... the part that throws me off the most is the fact that it is soooo intermittent. i started it today and it idled great and revved well enough to do a burnout. im baffled here.

 

a couple more details. im really busy i can put my hands on the car every other week and i apologize for that inconvenience.

 

so far i have replaced the fuel filter, injectors, injector plugs, distributor,(maf(not new)) and ignighter box. fuel pressure is excellent by the way. and so is vacuum when it idles. the car has 67,xxx original miles

 

im just looking for a list of things to test and check. thanks guys for all the help!

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Hello, am having the same problem with my 86 I was going to start a post but,

 

Lets figure this out toghter

 

I have an 86 51k

New Fuel Pump Walbro 255

New Fuel Filter

gas Tank cleaned out and sealed

Gas line flused.

New Head from Dad,

New Water Pump

 

Now when I start the car it dies, unless i keep giving it gas am currently running the 86 Triliogy Injectors

 

Now, Heron tried a fix for me in the mean time, he did a jump from one injector cable to the other.

 

Am now able to start the car and it idles great but I die out after 3000 RPM

 

I have changed the ECU and nothing, so dont chnage the ECU yet. I belive its either the injector, one bad injector clip, and both on mines are new by the way but you never know.

 

Or an electircal problem.

 

I will post pics tonight or tommorow off the jump wire trick Heron did this maybe this will work for you in the meantime till we get both are cars running probally.

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i can keep my car idling at wide open throttle but its like at 450 rpm... it seems like if the injector wires were to touch each other or ground you would kill an injector driver. have you switched the injector wires? i already changed ecu's does anybody have an 86 ecu pinout??
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inj resistor block in on pass side rad suport in front of air filter houseing , it's a two resistor block one wire going in and two wires comeing out,, both resistors are 6 ohm rsistors , in a pintch you can use any coil ballist resistor to get by substituteing for a bad resistor untill proper rssistor pac is located ,, the resistors drop the batt voltage down from 12 volts to aprox 6 volts durring inj operation,,but when testing you will see 12 volts out because there is not load on the circirt

 

all years are the same

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guys i feel i need to say this one more time stop replaceing parts in an effort to find a problem,, test and troubleshoot,, only replace a part if it fails testing , all you are doing is wasteing money and time,, odds are real good the problem you both ahave is a bad or broken connection , esp if it works on day and not the next ,,cleaning and instecting connections costs you nothing but a littole of your time and there is NO SUCH thing as a wasted time cleaning connection even if it did not fix your problem
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Just a shot in the dark......... if you jiggle the key in the ignition will the motor shut down? Try it in all directions. I'm wondering if you have a bad connection in the ignition switch.

 

good idea i have found about 4 bad ign swts over the years ,not often but often enought to make sure you test check them

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i know you said not to shelby but the ignition switch was one of the first things i replaced.(forgot to add that in there)

 

i did not say not to replace a part what i said was try to prove a part is bad first ;) do your self a favor and keep the old swt

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