At first I thought it was water in the gas line and was told by the dealership to get the water treatment. It is still doing this. When sitting at a stoplight my engines revs up and then back down. I put the setting on the rpms and it starts at about 700 then drops to 650 then drops to 550 and back to 625.
Torn intake boot on 2000+ Northstar requires removal of intake manifold along with injectors-about 4 hour job not just 2 clamps as suggested. New seals required could also run past $100 so $500 is not unreasonable
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Re: Motor is reving up and then back down
More possible suggestions...coolant temputature sensor .. TPS or even mass airflow sensor ... you should get codes checked for soft codes and real time monitoring to see if sensors are in their proper range /window ... please advise once you have it tested
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Check the lines good and change the fuel filters. Look for line leaks, holes, or poor fittings on all ends. You may be sucking in debris within the lines and this could be a problem. Also water in the lines or bad gas can damage filter and pumps. Use Gas additives.
remove fuel line from fuel rail end and put switch to on position let some fuel come out from line, then replace fuel filter, check oil if any water marks in oil if not fix fuel rail line back you are readu to use it normal.
It would be good to know the make, year and model of the van to do a diagnosis. I'll take a stab in the dark, High reving could be caused by a faulty idle air control motor, common on a Ford. Is the Service Engine Soon light on? A malfuntioning Throttle position sensor will cause a high idle. I wish I had more info so I could be of help, Good luck, Gary
The white strip of fluid on the oil is a slight amount of coolant getting into the oil . The water could be from condensation on the dip stick. I would drain the oil and just put regular recommended oil in it with a new filter. I would pull the spark plugs and check for any coolant or oil residue on them.Then drive the vehicle a little and check the performance. If there is unusual noise from the engine then or blue smoke from the tailpipe the engine has internal damage.
Assuming the engine performance stays the same. There could be a fuel injector sticking intermitantly.
i also have a '95 ext. cab silverado got it Dec. of 09 I love it come the middle of Jan. '10 It started to hesitate, push the gas no power, it herks and jerks, to me it sound like its gurgling when i push on gas. Just today i came across this site (http://www.carterfueldelivery.com). i am now going to check and do what i have learned. see i changed the TPS, o2 sensor, blown the gas lines out, checked the MAP sensor, EGR valve and sensor and much more........ SO HOPE THIS HELPS BOTH OF US.. GOOD LUCK