'member that Volvo????

[Banjo]

Yea, my dads 91 wagon. The one I put a motor in last year.
Well, It's been runnin fine till about a week ago.
the idle started acting funny, and it was starting very hard at times. So he took it to my uncle, who has a small shop. He replaced the crank sensor. al seemed good for a short while. now it's right back to where it was.
I've cleaned and tested the IAC valve. it's ok. Checked the intake air temp sensor, the coolant temp senser, all vacuume hoses, all seem fine.
I got it so it wouldent start, then when I wiggled the wiring loom that the injector wires went to It seemed to come back to life. So I cut open the loom to find the bad wire. nuttin. all fine. I think I'm loosing the injector pulse. I gotta get a set of noid lights tomorrow to see.
It only made it to the end of my street on the way home. I wound up pushing it the rest ot the way, and it woulden't restart till it sat for a few hours, then it ran only for a very short time.

I'm really starting to suspect the fuel control computer. I think I'm gonna hit the junkyard tomorrow to see what I can find.

anybody else have any ideas ( aside from selling it, or crushing it, or blowing it up?)

 

[philman]

ignitor module overheated at sometime? somebody put in diesel by mistake?

 

[DrEntropy]

Lift pump inna tank.

*nudge-nudge, wink-wink*

 

[14dna]

/bcforum/images/%%GRAEMLIN_URL%%/iagree.gif

Listen to the Doctor.

Besides those things are indestructable, so how would you crush it?


Dave

 

[jessebogan]

Not knowing for sure which 91 volvo, I can't be specific. Here are a couple of common Volvo faults. First is the mis named "Radio Suppression Relay"found under the hood on one shock tower or the other. They are around 30 bucks from the dealer. These things go bad all the time, and cause the car to stop running without warning. Most of the engine electrics run through this relay. The Fuel Main Relay will also do that, and I usually replace them both if there is any question.If the distributor cap is on the back of the head, IE B230, or 230F, remove the cap, and remove the black plastic flash shield.Examine the posts on the cap where the plug and coil wires attach REALLY carefully for tracking. I have had a couple of these drive me nuts until I figured it out. The age of the cap is not important, check it anyway. Hope this helps anyway.

 

[Banjo]

I'm heading outside in a minute for a fresh round of battle.
New things I've found.
when cold, it starts and runs fine. it'll run for about a minute, then shut down.
When it's not starting, I can still hear the fuel pump run, with a noid light I have no injector pulse
It is a 740? I think. it has the B230 motor.
When we replaced the motor less than a year ago, It got a new timing belt, and all the tune up stuff (cap rotor wires plugs)
It had a hard start issue, along with a high idle issue a week ago, swapping the crank sensor seemed to solve the hard start, but not the idle (for a very short time).
Now it's the no-start/ stalling
Jesse, I read earlier today in the chiltons manual about that realy that runs the injectors.(radio supression relay) That is my prime suspect at the moment.
Time for some testing.

 

[Banjo]

Scouting mission to the U-pull-it tomorrow for a functional "auxillary relay" AKA Radio supression relay.
Tap test resulted in the car dying instantly, and my test lead showing no output power from the relay untill I tapped it again.
Hmmmmm.
Thanks for confirming my suspicions Jesse.
Keep watch here. I may still be chasing an idle issue.

 

[Banjo]

Jesse,
You were right. Radio supression relay. I spliced in a generic 40 Amp relay (same rating that was on the volvo unit) and it's running like a swiss watch.
Junkyard diden'thave anything.
I had the relay sitting around, and just coulden't justify ordering one from the Volvo dealer, 30 miles away, when there's nothing special about it besides the type of connector.
Between the relay, and cleaning and adjusting everything to do with the intake system, it's back on the road. For a good while I hope.
Thanks guys.

 

[Bugeye58]

Ben, I carry a spare radio suppression relay, and a spare fuel pump relay in both my 740 Turbo Wagon, and my 850 sedan.
Kinda like having a spare ballast resistor in the glove box of every Mopar I ever owned.
Jeff

 

[jessebogan]

Its funny, I work on Joan Claybrooks (Yes, THAT Joan Claybrook)850. She sometimes takes it to the dealer if I am too busy to get her in right this moment. She was having the stalling problem, and the dealer replace the lifters! and some other poo poo. The car still stalled. I got the car, and replaced the two relays. No more stalling. I have known about them for years, why dosen't the dealer??? I bet there was a service bulletin back in the day....

 

[Bugeye58]

Jesse, the reason the dealer replaced the lifters is that the relay swaps don't pay enough! /bcforum/images/%%GRAEMLIN_URL%%/grin.gif
I've known about the relays for years, too, but have only had my Volvo's for about three years. I've friends that are Volvo <u>fanatics</u>, so get kept up to date on things like that.
Jeff