89 Blazer Wouldn't Start Now Running Rich

[Rmbodie]

I put a "T" in the fuel line where it come out of the frame between the front driver side tire and the exhaust manifold . On my 89 it has a two inch peice of rubber hose there . There are three lines there . The front one is the supply . I don't have the skirting material so it was really accessable especially with my lift kits . Rob

[Rmbodie]

Also , there is a red insulated female blade connector which is located near the brake booster . You can supply 12 volts to it to run the fuel pump with the ignition off . I used that to prime my carb . Rob

[Markgc]

I am suspicious of the fuel pressure and that needs to be measured next. I see the fuel filter. Do I need to remove it and put some sort of T adpater temporarily in it's place ? Any idea where I can order the right adapter/gauge to measure the pressure? MT-2000 have you done this before?


thanks Mark

[MT-2500]

Your local parts place or tool store should have some adapters.
Yes I do it 2-3 times a week for the over 20 years the tbi system without the fuel pressure test port has been out.
MT

[Markgc]

I am not having much luck with finding an adapter - do I need to remove the fuel filter and put a T piece in it's place? Is that what you mean to do. I am not finding anything on the web. Any idea what the threads are?

I am not finding any ports on this vehicle for plugging in a pressure gauge. Most vehicles have a place to measure the pressure. They didn't seem to bother on this vehicle, making a simple procedure a PITA.



I have a pressure gauge. Myabe I need to modify a fuel filter and solder or braze in a pressure take off port to a new fuel filter.

thanks Mark

[Markgc]

OK I think I see - I will have a look in Lowes - they keep all sorts of fittings.

I have to make something like this guy made


http://minimopar.knizefamily.net/quickfpg.html

My first step is to buy a fuel filter so I can match up the threads in the hardware store.


Mark

[MT-2500]

Do not try to jeery rig it up and mess up your fuel lines.

They are special o ring type fittings.
Hardware store does not have anything like it.
They are automotive type fuel line fittings.
Just get the right fittings from a parts place that sells or rents fuel pressure gauges.
But if you want to go to all of the trouble you can get some fittings off of a salvage yard car or take a fuel filter and take fitting off of it or hook/soder another hose fitting into it.
Up to you.
MT

[Markgc]

Yes I would rather just buy the right part but I am not having any luck in finding anything suitable. I am looking on the web but not seeing anything other than aftermarket fuel gauges. Whre did you get your fittings?

The parts places in town don't seem to have anything suitable. GM didn't give much thought to this did they. The shop manual isn't much help and gives the wrong instructions but quotes a gauge J29658A/BT 8205 and adapter J2968A-85 to go between the steel line and flexible hose in the engine compartment. However the flexible hoose is crimped onto the steel hose so this is obviously not going to work.

As you say I don't want to mangle up my fuel line fitttings with the wrong fittings.

Mark

[Markgc]

would any of these work for me

http://www.jegs.com/webapp/wcs/store...0019&langId=-1

[maverick watson]

key man i had a similar probablem with mine same year it was the oxygen sensor but even having a leak in ur exhaust throws the voltage off and then makes it run richer so try that i guess!

[Markgc]

Thanks for the Oxy sensor tip. Right now I am getting a reasonable reading from the o2 sensor but I haven't ruled it out yet. I can't start the engine right now. I am going to have to change the fouled plugs I expect before I can get it to start again. I don't want to run it too long with it running so rich. Before I do that, I just want to check the fuel pressure. it will probably be OK but that will be one less thing to worry about. After that I am going to have to tack in a wire form the starter solenoid so that I can remotely crank the engine while I am under the hood.


In the meantime I am going to add a fuel gauge like this guy did

http://www.rx7.org/Robinette/fuelp_gauge.htm

but I am going to put the gauge fitting near where the fuel filter fits. I can use the rubber hoses in that area. I may then remove the gauge but leave the T fitting there with the gauge port blanked off with a blanking bolt.


Seems like the best plan to me right now

[BlazerLT]

Has the timing been reset and has the ignition module been checked?

[Markgc]

I had a spark before and it was running but running really rich. Now it won't start but the plugs are probably fouled and I think that I will need new plugs before it will restart. I wanted to check the fuel pressure before I attempt a re-plug and restart. I will check for a spark at that time but I had one after the vehicle was towed home. I am not seeing any engine rpm on the scan tool when the engine is cranking which is a concern.

What is the procedure for resetting the timing? I am not sure if advanced or retarded tming can effect the mixture as much as it is. What do you think?

[BlazerLT]

If it is overly retarded it can.

You will haqve to disconenct the timing wire from the PCM and set the timing to zero.

[Markgc]

retarded timing - thank you. It didn't sound retarded but that might account for why the exhaust gasses were so hot.

PCM - what is that one? I will study the manual regarding ignition timing.


Something else to look at - may tie in with no rpm signal showing on the scan tool while cranking


Mark