Hello, everyone! I haven't been on here in a long while. Between health problems and wrecking my 740 turbo sedan, I've been driving a toaster and busy with life in general.

I bought a 1990 NA 740 with Regina engine management, and I am pretty new to the system. I bought it from my friend's widow after he died suddenly last year, but haven't picked it up yet. I've gone over and looked at some things to make sure it will make the trip to my house.


He had issues with it stalling while driving, and it does not start easily. He replaced the single in-tank fuel pump with a cheap one off ebay. I have another better (Walker or Delphi, I think) one to replace it, and hope that helps. On my advice, he tried adding in a Bosch fuel pump in addition to the in-tank pump. It didn't make any difference in his stalling problems.


Opening the throttle makes the car bog, then recover. It does currently have a broken off nipple on the flame trap, but it's sort of capped off on both ends.

The MAP sensor had a clear vinyl tube running from the smallest nipple on the intake to the sensor. I believe it's supposed to go to the larger of the 2 vacuum nipples.
The idle was about 1200 before adjustment, and is now around 1000-1050, which is way higher than seems right. Even so, I am not finding any vacuum leaks or reasons it should be so high. Maybe there is a


-Is there a good "welcome to Regina" page? I know LH2.4 like the back of my hand, but not so much Regina.

-Does the MAP sensor need a special type of tubing? I have 1/4" fuel injection line on it now. I made sure to clean out the vacuum nipple into the manifold.

-Is there a common trend of a hard transition from on-idle to off-idle? The TPS and throttle body had been fiddled with quite a bit, but I think I have it almost right now. It's hard to tell if it's 100% closed without removing it, which I will do once it's at home. The switch is adjusted so it clicks just as it hits the stop, but I don't trust it until it's off the car.

-I bought a used IAC motor for the car. Is this a common failure?

-Is there anything special about the Regina system I should know? Any pitfalls or waterfalls I shouldn't chase?

Thanks!

I can't wait to be back to a RWD volvo again.

Happy bricking

When I first bought my Rex/Regina 1990 740 I had an intermittent stalling issue. Turned out to be the coil. I haven't had that problem in years now.

FYI Rex-Regina MAP Sensor Volvo Part #3517892 is identical to GM Part#12569240 for half the price.

Hope that helps. Good luck!

Often times if you just open up the Rex coil pack (two torches screws) you can clean the internal contacts and that will cure the intermittent ignition problem.

A timing light on one of the plug wires and a fuel pressure gauge on the fuel rail will help you determine whether it’s an ignition or fuel issue that correlates with the stalling. One exception to that would be the Radio Suppression Relay. If it breaks down due to heat it won’t show up as a fuel pressure OR ignition failure. Swapping it with the neighboring fan relay is sometimes a quick test to see if it was the problem.

--
Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)

Welcome back.

Don't believe there's such a thing as a Rex/Regina rest stop or welcome center here or elsewhere. You're a 700 veteran, and my opinion is the one most important plus for 7/9 owners is the existence of Steve's compendium of our experiences known as "the FAQs." That, and the ability to remove the cabin air cowl. :)

You should start with fuel delivery. Any mod like you proposed to the PO needs extensive care in implementing, but the end result has to be correct fuel pressure at the rail. Know that it works before getting involved in the rest of Regina. While you've been gone, I've read of Regina pump replacements that were done with parts-house recommended pumps that were not really up to the job. Something about the desk jockeys who put together cross tables.

The unusual IAC is an interesting subject. I would like to look into this some more one day, even though I shall not ever own a 7/9. But for now, make sure you have fuel.
--
Art Benstein near Baltimore

If there are no dogs in Heaven, then when I die I want to go where they went.
-Will Rogers