1991 Olds 88 Fuel Delivery Problem?

Question

I am trying to figure out what the root cause for this problem could be. The vehicle performs fine, for one its age, around town and short drives. When I travel on the Interstate for more than 30 or so constant miles, or if I run around town for about an hour constant, it begins to act as if it not getting any fuel.

Plenty gas in the tank and the pressure is good... Field checked it and unless it can possibly be "too high", it looks to be fine.

Filter was changed about a year ago. Plugs done about 3 months ago.

Any idea?

Answer 1

Coil Pack overheating? Air filter?

Answer 2

The most common fault here for this vintage G.M. is a failing fuel pump. They work fine while they are cool, but as they heat up, they begin to require more power than is available to operate. It is necessary to check BOTH the pressure and flow rate WHILE THE CONDITION EXISTS.
Another common failure is the MAF sensor. As the vehicle continues to run, the "Hot Wire" conditions become contaminated. Sometimes the sensors can be "cleaned" but this usually doesn't last long.
In addition, go here------>

http://autorepair.about.com/library/ts/obd-i/bl-dtcs-96.htm

...and follow the procedure discussed below the definitions chart for retrieving the Diagnostic Trouble Codes.
With the codes in hand, refer to a repair manual (library, Amazon, parts store etc) for the proper DIAGNOSTIC procedures.
AFTER DIAGNOSIS, perform necessary indicated repairs and or parts replacement.

Good Luck

Answer 3

I would suspect of the filter. It looks like a flow rate issue rather than a pressure issue.

It takes no time for a filter to get plugged if your tank was not clean.
Also, the fuel pump could be giving less flow rate and still pass the pressure test.

Answer 4

I had a Buick Regal that used to do the same thing.Acted for all the world like a bad fuel pump.Saw the same thing happen to a
Pontiac Sunbird.
Lets just say that out of necessity,I've "spun" a wrench or two in
my life time.The thing drove me loopy!!!
A GM mechanic that I knew told me to have the ignition module
located inside the distributor checked at our NAPA store.It seems
to be a common problem for GM vehicles.
Solved the problem both cases.Wherever you have it checked,
make sure they let the module warm up.

Answer 5

First did you place gasoline interior the tank, next see if your pick the flow bowl needle is sticking, faucet the edge of the gasoline bowl this could loosen it, you in all probability have previous gasoline that 'carmelized' with the intention to communicate interior the gasoline bowl, because of the fact it sat for see you later and dried out, it leaves in the back of a residue that sounds like dried up carmel and sticks up the pick the flow needle and then little to no gasoline can get into your carb. Now those previous fords have a gasoline pump that has a bad habit of letting gasoline get previous the diaphram while they have sat for a protracted time i understand I had one (went to an electric powered pump), not in basic terms does your carb dry out yet so does your gasoline pump diaphram, and then leaks later not arising the suction had to tug the gasoline from the tank to the carb. you may examine you gasoline pump besides, as on your gasoline pickup interior the gasoline tank those infrequently, if ever bypass out, this is in basic terms a sock honestly that suits over your pickup tube, and in case you pay attention something damn around this is in all probability your pick the flow on the tip of the sending unit for you gasoline gauge, and in case you pay attention it damn around sounds such as you particularly choose, gasoline. solid success.