I have a 1997 Chevy S-10 4WD/ Auto/4.3; has anyone found that a faulty oil pressure sensor causes the ECM to shut down the fuel pump?

Asked by Sep 30, 2014 at 11:57 PM about the 1997 Chevrolet S-10 LS Extended Cab 4WD

Question type: Maintenance & Repair

Started the truck cold on a morning a couple of weeks ago, drove about 2.5 miles and it just shut down.  Wouldn't start again.  Felt and sounded like it was out of gas, so I borrowed a gallon, poured it in and tried again, cranked but would not start.  Thought gas level might still be too low somehow so went and bought 5 gallons and a can of cold start.  The added gas did nothing, but when I cranked the engine and sprayed the cold start into the air intake, it sputtered and started.  Good, thought that was it and drove away another 1/2 mile when it happened all over again.  This time no amount of cranking, ether, battery jumps, etc. produced anything.  Three hours later we towed it home. I could hear the fuel pump coming on, but no start. I found almost no pressure at the fuel line test port, concluded the filter was probably clogged, changed it, found better volume at the test port, but not much better pressure.  Still no start.  Changed the pump figuring the problem was either with the pump or the pressure regulator and thought the pump an easier fix.  Still no start. Fuel pressure reading at first key on/engine off cycle was about 5lbs.  Cycled it again and it rose to about12lbs, again and pressure rose to 25lbs. Did this again and again until at about the 5th or 6th time it arrived at something over 60lbs briefly then fell to 52lbs, where it remained.  If it fell at all after that it was very slowly. I had been told that the injector required 61-65 lbs pressure to fire.  So I concluded the pressure regulator was at fault.  Replaced the regulator, started the truck, checked the fuel pressure again with engine running and it read 52lbs!  Fine!  Some wrong info;  Gave it gas and the RPMs went right up.  Problem solved.  Thought a test drive was in order.  Drove about 2.5 miles, the engine died, and here we are again.  It seems to me that something is turning the fuel pump off after the engine has been running a little while.  Could it be the oil pressure sending unit is sending a bogus signal to the ECM and triggering this problem?

6 Answers

108,585

Or a bad fuel relay,

2 people found this helpful.
50,305

Yeah or both.

21,400

I think AutoZone will test the relay for free.

1,205

It could also be the 'Gas Tank Filter" & 'Not the 'In-line Filter'... Sediment that is sucked up thru this filter from inside the gas tank can get clogged as well. Check to see if the 97' S-10 has this filter and let us know, ok?

Hi! The trouble turned out to be a faulty ignition control module. I had it tested at the beginning of my effort to repair the truck but it tested OK. However after making all the rounds and finding nothing worked, I retested the module at two 'other' parts stores and it came up BAD. Returned to the original testing location, retested and the unit was declared 'good'. Bought a new module-problem solved! Thanks for the suggestions, anyway. JC1948

10

When testing a ign module you need to do it several times when having a problem where they will drive a ways before shutting down. If it isnt warmed up it wont break down.

1 people found this helpful.

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