850 sedan 1994 Car will not start

blueberry1 · Post by **blueberry1** » 30 Sep 2009, 08:13

Ok, I took the codes of terminal A6 and it came back 1-1-1. I repeated the procedure just to verify and it did the same thing. In the meantime, I noticed that with the ignition key in the ll position, the IAC was buzzing so I attempted to start it but no dice. Also I once again checked the schrader valve at the end of the fuel rail and I noticed no gasoline coming out and no pressure as well. Stumped!

Post by **Ozark Lee** » 30 Sep 2009, 09:30

Jumper the fuel pump relay with a paper clip, it is relay 103 and it is located under the fuse box cover. Remove the 4 T-25 torx screws to get access to the relay. Once you remove the relay you will find pin numbers molded into the plastic next to each of the terminals. The numbers are 31, 31B, 15, and 87. Jumper the socket positions associated with 15 and 87. If the car starts and runs at that point you need to repair or replace the fuel pump relay.

Here is a writeup I did on how to repair the relay.

https://www.matthewsvolvosite.com/forums ... php?t=9681

If you still have no fuel pressure then your fuel pump is likely shot. You can sometimes get it to run again by smacking the bottom of the fuel tank with a ball bat but that only works once or twice.

...Lee

blueberry1 · Post by **blueberry1** » 30 Sep 2009, 13:38

Thanks for all your help and suggestions. I tried the checking on the fuel pump relay and it seems to be working because it's causing a slight buzzing sound where the fuel system relay ( gray ) is, right below the shroud. I left the ignition on position ll and I heard the noise emanating from the gray relay. I then pulled the relay 103 off and the noise stopped. I put it back in again and proceeded to start the car and no spark. I did all this after I gave the fuel tank several good whacks with the ignition on the ll position. I'll clean the MAF and the sensor if that's helpful but i doubt it'll start.

I'm about to just pack it in. I think I'm done.

Post by **misha** » 30 Sep 2009, 16:38

If you have no spark then i suppose that your ignition coil is bad.It is located at right side of engine compartment.On this picture it's circled in green:

This could not looks like yours because this is upgraded/modified one,but they are in the same place.

volvomileage · Post by **volvomileage** » 30 Sep 2009, 18:57

i agree with Misha

no spark could be a faulty coil or camshaft sensor (or hall sensor )
i had this issue with my car in my case the faulty cam sensor would not let car start ...and this sensor never gave an error code...double check your connections before..

hope it can help

blueberry1 · Post by **blueberry1** » 02 Oct 2009, 13:31

I checked the ignition coil and there is spark. As a matter of fact I attempted another start but i decided to clean the MAF sensor again and it started for like 3 seconds and then died again. I decided to see if any codes came on again so i checked A2 which yielded nothing ( 1-1-1) and A6, same result. But when I did A7 it gave me 1-2-2, which is saying "Fuel gauge sender unit open circuit" and 1-1-3, " Temprature signal interval too long". What does it all mean?

Post by **Ozark Lee** » 02 Oct 2009, 14:25

blueberry1 wrote:Thanks for all your help and suggestions. I tried the checking on the fuel pump relay and it seems to be working because it's causing a slight buzzing sound where the fuel system relay ( gray ) is, right below the shroud. I left the ignition on position ll and I heard the noise emanating from the gray relay. I then pulled the relay 103 off and the noise stopped. I put it back in again and proceeded to start the car and no spark. I did all this after I gave the fuel tank several good whacks with the ignition on the ll position. I'll clean the MAF and the sensor if that's helpful but i doubt it'll start. I'm about to just pack it in. I think I'm done.

The gray relay itself really shouldn't buzz, the idle air control valve should. They are right across from each other so it may be difficult to discern where the sound is coming from.

What makes no sense to me is that the buzzing stopped when you removed relay 103. The two relays are completely independent of each other. Did you ever try to jumper the relay 103 socket between 15 and 87?

Lets back up and figure out which system is giving you trouble. You indicate that you do have spark so for the moment we will assume that the ignition system is OK.

The next thing that we need to determine is if you have fuel pressure. After you try to start the car press the schrader valve on the end of the fuel rail, have a rag handy and wear eye protection. You should get a good squirt of gasoline out of the schrader valve. If it just dribbles out then you have a fuel pump or fuel pump relay problem.

Assuming that the fuel squirts out with good pressure then the next step is to determine if the fuel injectors are firing. A quick and dirty way to do that is to touch one of the injectors and have someone crank the car. You should be able to feel them tick.

So if you have spark, fuel pressure, the injectors are firing the next step is to do a compression test. You will need a compression gauge to do that test, I think that they can be "rented" from many auto parts stores. If not you can get one at Harbor Freight for around $10.00. It may or may not be absolutely accurate but it will be good enough to know if you are in the neighborhood.

At its simplest there are only three things that it takes to make an engine run, fuel, compression, and spark.

Don't worry about the A-7 codes right now, those are for the instrument cluster.

...Lee

blueberry1 · Post by **blueberry1** » 06 Oct 2009, 11:56

Ok, am I correct in assuming that if it is indeed the fuel pump, should i replace it with a new one and not a used OEM fuel pump of the same kind and manufacturer? I am leaning towards purchasing one since I have checked the schrader valve and there is no pressure at all. But man, is that fuel pump expensive!! It cost between $ 271.00 to $ 405.00 depending on who your buying it from. There is a new one listed on ebay for about $ 75.00 and that may be the cheapest ( affordable ) I have seen yet. What your take on this fuel pump issue?

Post by **misha** » 06 Oct 2009, 12:03

Walbro or hella fuel pumps will work just fine.But...beware of cheap chineese copies.
You can buy it at http://www.fuelpumps.com,it's number is 5ca3351,but you need to do some modifications to install it at original fuel pump housing.
Or at http://www.europartsdirect.com (as i remember).

Those aftermarket brands of fuel pumps are almost good as oem Bosch.

blueberry1 · Post by **blueberry1** » 06 Oct 2009, 12:54

So in that case go with new instead of a functioning used OEM f pump....?

850 sedan 1994 Car will not start

Re: 850 sedan 1994 Car will not start