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I know nothing about cars... is this too much to handle myself?


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#1 hawkandhorn

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Posted 22 February 2018 - 07:27 PM

Hey Guys,

I have an '87 conquest. Just had the stock engine rebuilt.....they said they found 3 cracked pistons. They replaced the bearings, pistons, seals, etc....

The car ran when i dropped it off, and I drove it there. It would chug at high speeds and had low compression on cyclinder 3... which is why i had it looked at in the first place..


Anyway, now they are saying the engine is fixed, but that 1 of the fuel injectors is not working....they switched the physical injector to the other lead, and it worked fine, so they dont think it is a problem with the actual injector.....they think its a wiring issue or a ECU issue....

I frankly know very little mechanically..... should I tow it home, tinker myself...or tow to an auto electrical shop?


They said it idles, and runs...but don't recommend driving it without all the injectors so it doesnt blow up again..

any ideas?





#2 Preludedude

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Posted 22 February 2018 - 07:35 PM

What is it doing wrong?  Still too vague....

#3 Hoosierquest

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Posted 22 February 2018 - 07:38 PM

If they swapped the leads and the secondary injector worked I would look into replacing the injector pigtails.
http://www.enginemac...ms/conquest.php
for replacement.
Dad the owner is a member here.

Edited by Hoosierquest, 22 February 2018 - 08:07 PM.

<a href="http://s102.photobuc...t=100_2004.jpg" target="_blank"><img src="http://i102.photobuc...h_100_2004.jpg" border="0" class="linked-sig-image" /></a>

87, .030 over JE's, non jet head, small 16G. Delphi injectors.  Quest owner since 2000.

#4 FRO

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Posted 22 February 2018 - 08:32 PM

There are several member in LA. Arrange for a small meet and greet and ask for some fresh eyes to look at the issues with you. I’m sure you will have a good time and learn a lot in just a few hours.

#5 TexasQuest

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Posted 22 February 2018 - 10:26 PM

Definitely try and find some local members who can help you out. These cars can dumb found a lot of shops.
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View PostJohnnyWadd, on 04 March 2010 - 10:01 PM, said:

my shaft was big i dont know what your talking about.

#6 Indiana

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Posted 22 February 2018 - 11:22 PM

View Posthawkandhorn, on 22 February 2018 - 07:27 PM, said:


I have an '87

They said it idles, and runs

87-89 Fuel system basics- it starts, idles, and drives on one injector.  The secondary doesn't spray until higher rpms, quick push of the pedal or boost.   You could unplug that other injector and drive like my mom and never know it.

#7 Hoosierquest

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Posted 22 February 2018 - 11:25 PM

Thread Jack but good to see you comment Indiana!
<a href="http://s102.photobuc...t=100_2004.jpg" target="_blank"><img src="http://i102.photobuc...h_100_2004.jpg" border="0" class="linked-sig-image" /></a>

87, .030 over JE's, non jet head, small 16G. Delphi injectors.  Quest owner since 2000.

#8 hawkandhorn

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Posted 23 February 2018 - 12:00 AM

View PostIndiana, on 22 February 2018 - 11:22 PM, said:

87-89 Fuel system basics- it starts, idles, and drives on one injector.  The secondary doesn't spray until higher rpms, quick push of the pedal or boost.   You could unplug that other injector and drive like my mom and never know it.

So would it be safe to drive home if i keep it under 2500rpm?

#9 SA22C

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Posted 23 February 2018 - 12:04 AM

You will be fine driving it like you say. I would also leave that shop as fast as I could while staying under 2500rpm.

#10 Fuze

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Posted 23 February 2018 - 10:34 AM

The problem sounds like bad wiring probably at the injector itself or near the throttle body.  It's not likely that is the only faulty wire though. The only way to be sure is to look at all the wiring around the TB and sensors and fix any wires that are cracked, corroded or broken. Give it all a good look, tug on the wires and connectors, and re-solder any that are not tight and flexible.

Edited by Fuze, 04 March 2018 - 11:24 AM.

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#11 fixture

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Posted 23 February 2018 - 01:59 PM

Where are you located? In CA = LA or in LA = Louisiana?

#12 techboy

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Posted 23 February 2018 - 10:12 PM

One sentence in your OP jumps out at me. You said it had low compression on cyl 3, and that the shop now says the "engine is fixed". My question is ... what did they do for you? How did they "fix" the engine? Just curious on your behalf.
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#13 hawkandhorn

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Posted 26 February 2018 - 10:04 PM

The cylinder heads, bearings, gaskets have all been replaces...

I have the heads and literally there was a cracked ring on every single one....it has all been replaced and fixed now.

Now the secondary injector wont fire...but the shop said they switched the leads and it worked then..so they think its a wiring issue and are scared to do that.

I just purchased 2 new Bosch injector leads that I'm going to solder on and see if that does it...fingers crossed...

It definitely has already had the clips switched before from the electrical tape on the wires...hoping it just shorted out.


My question is how do i know what piece of wire goes to what wire on the clip???

There are all white and not colored positive and negative?

#14 hawkandhorn

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Posted 26 February 2018 - 10:12 PM

piston heads ...and piston rings i meant

#15 hawkandhorn

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Posted 27 February 2018 - 03:38 AM

View Postfixture, on 23 February 2018 - 01:59 PM, said:

Where are you located? In CA = LA or in LA = Louisiana?

Los Angeles

#16 Hoosierquest

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Posted 27 February 2018 - 09:36 AM

Pretty sure polarity does not matter on the clips. Just try to match them how there are now.
<a href="http://s102.photobuc...t=100_2004.jpg" target="_blank"><img src="http://i102.photobuc...h_100_2004.jpg" border="0" class="linked-sig-image" /></a>

87, .030 over JE's, non jet head, small 16G. Delphi injectors.  Quest owner since 2000.

#17 SA22C

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Posted 27 February 2018 - 12:30 PM

Polarity does not matter as the injectors are fired by a ground signal.

#18 hawkandhorn

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Posted 27 February 2018 - 03:42 PM

Further down the rabbit hole I go....

so I tested the ohm rating on both injectors ... both around 2.6... which leads me to believe they are good, I did notice some gas near the top of the primary though...anyway

I then tested the voltage on the clips with the key turned on but the engine off....  I definitely didnít get anyway near to 12 both were extremely low.. and the secondary clip was near non existent

I then soldered in the new secondary clip and ran the test again.

Primary injector clip voltage was around 4 and would steadily drop over time   Secondary injector was at like .5 volts and dropping over time .... any ideas?

Bad Ecu or isnít there some power fuse that the two positive leads of both injectors run to? What should I do next to diagnose the problem...

Here is the crazy part the car turns on and idles with just the primary and the shorty low voltage

#19 croquest87

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Posted 27 February 2018 - 05:07 PM

These are low impedence injectors and have resistors for each injector  little box in between air box/and pass side headlight   look up factory spec on what the voltage should be  it may vary  as full voltage is aplied to open and reduced after or something stupid like that peak and hold maybe? Anyone?

Edited by croquest87, 27 February 2018 - 05:09 PM.


#20 SA22C

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Posted 27 February 2018 - 08:24 PM

I've also witnessed knock boxes due some goofy crap at the injectors. If you've got a plastic knock box and not the 88-89 box I'd check with a known working knock box.




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