Agent_D

iTrader: (2)

well, what exactly happens or how does the car feel if the solenoid resistor is bad, i cant tell if mine is or not because i dont have a working OHM meter to check it out from the book specs. TIA

J-Rat

iTrader: (2)

are you talking about the variable resistor?

Agent_D

iTrader: (2)

dont know, the book calls it the solenoid resistor, which is located under the stock air box, the silver rectangular thing

J-Rat

iTrader: (2)

Oh, for the fuel pump?

Agent_D

iTrader: (2)

no idea really, i dont know what it does, haynes manual doesnt say, just says its the solenoid resistor lol

J-Rat

iTrader: (2)

Its for the fuel pump. I am sure of it. It changes the voltage of the fuel pump depending on if you are idling or whatever. It can cause your car to run rich at idle, and if it fails horribly, it can cause your car not to run at all. Whats your car doing?

Jarrett

Agent_D

iTrader: (2)

my car idles perfectly, it feels kinda weird past 3800rpm, it hesitates at that point, which im going to ground the ECU and see if that fixes it since i have the 6 ports wired open, and it doesnt seem to pull as hard as it should to redline, but maybe its just me, i havent had anything to compare to yet, i need my buddy to get his n/a FC running so i can see for sure, im not sure if the secondary injectors are coming on

FC Drifter

no, youre talking about the fuel injector resistor pack. its the thing under the airbox, behind the pass side headlight that makes early 87 FCs have the high impedence(or low impedance i cant remember) going to the fuel injectors. how it affects your car if it goes bad i dont know, ive never experienced it or even heard of it happening. my best advice is to get an ohmeter and check it to see if its working properly. most likely its not bad, judging from how you describe your cars beavior. you describe the classic 3800 rpm hesitation that most FCs suffer from. it could be a million things from bad grounds, to shorted wires. i dunno whats causing it though. but im pretty sure your secondaries are coming on, you most likely would have poped the motor i they didnt. im not sure how wiring 6 ports open affects the car, ive never had an N/A but i do recall hearing that it kinda makes it feel less torquey. its going just as fast or faster, but doesnt feel that way. but again i dunno, ive never had or worked on an N/A before. hope that helps some.

silverrotor

iTrader: (1)

I know when HKS Turbo II's Solenoid Resistor was bad It was clicking like an epoleptic squirrel.

He swapped It out and all was well.

NZConvertible

There's confusion here between the solenoid resistor for the injectors and the resistor/relay for the fuel pump. But AgentD's car is an 88 NA, so it shouldn't have either of them!

Agent_D

iTrader: (2)

all of the 8 N/A's ive had have had solenoid resistors, 86/87/and 88 models ive had, so i dont know

NZConvertible

IIRC, they changed from low-impedance injectors (which need the resistor) to high-impedance injectors midway through '87.

Liquid Anarchy

iTrader: (2)

you DO RC...

Agent_D

iTrader: (2)

well i unplugged it while the car was running and it died, and wouldnt start, so i assume its good lol

NZConvertible

Getting back to the original problem... As mentioned earlier, that's the good ol' 3800rpm hesitation as the secondary injectors come on. It's annoying as hell, but it dosn't have an effect at any other point in the rev range. Check out the sticky on grounding at the top of the page. The ECU and boost sensor grounds are particularly important. Wiring the aux ports open will only have a noticable effect below the point at which they're supposed to open. You won't notice any difference above that since they're supposed to be open anyway. You did wire them open didn't you... If they weren't coming on it would simply fall flat on it's face at 3800rpm. It would be like hitting a rev limiter and you'd never get past it. If you can rev past 3800rpm (and you say you can), they're working.

Agent_D

iTrader: (2)

yea wired open ports, i mean that it feels weird and not pulling as hard as the other n/a's ive had with open ports, that could be my exhausts fault though too, not sure. the grounding of the ECU fixed the 3800 hesitation in all my others

scott tsilis

i am putting an 88 motor in an 87 . the new motor has no wire for this so called solenoid resistor, the hayes manual calls it a solenoid register. since the new wiring harness has no plug for it ( a huge yellow one) does this mean that I have different injectors like this one guy was saying so i don't need to worry about it? someone please say yes!

HAILERS

It's a solenoid RESISTOR. It's just four resistors in a package, put up front to cool them down. They are used only for the low impedence fuel injectors found on 87 1/2 cars and older.

If the 87 car that you put the 88 engine in had a solenoid resistor package, then it had low iimpedence injectors. Use the 87 wiring harness and the 87 injectors. If you use the 88 harness then use the 88 injectors.

If you connect the new harness, as in just lay it in, and turn the key on, do you have 12v at the fuel injector plugs????? I'm too lazy to look a the fsm wiring diagrams to see if a 88 harness put in a 87 would have voltage to the injector plugs. I'll let you do that since you have a vested interest.