Question about 1985 GMC S-15

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Sometimes the engine sounds&feel like its missing.already change plugs wires look good could it be fuel filter

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A fuel filter will not cause a miss, has the distributor cap and rotor been replaced>

Posted on Oct 05, 2009

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How come while driving my transmission sometime jerks?


interesting, ricky ? could b anything. fuel filter needs changed, the fuel we use today is garbage, ethanol is bad for our older engines. add some of that new dirt to tank, something360. ??? also, maybe a wire connection is loose., or bad spark plug wires? something is missing its continuity , making the engine miss, not your transmission, u hope ? start with checking your battery conn., clean, tight, etc., replace plug wires, change spark plugs, maybe ? but your plug wires could b the problem. ??? think about it, engine starts ok, its when its running does the problem come up. you have fuel, you need spark, you also need clean air .......... change air filter....... pcv valve......egr valve ?? could b sticking ......you treat yourself good, yes? treat your engine good...whens last time the transmission fluid and filter was changed ??? that could also cause a miss, a surge......yes? i hope this helps you ricky, just use common sence, it always serves me well, good luck, ken

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You state you changed plugs and wires - Do distributor cap & rotor? If not you should then set timing. That should cure hesitation (might change fuel filter also and run good fuel system cleaner through it)
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Sounds like a fuel filter. Question - When was last healthy tune up? Plugs, wires, All filters especially fuel filter? I'd start there and then run a good fuel system cleaner through it. Ut'll give you a good "ground zero" point if problem continues.

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The ignition coil pack (the black thing all the plug wires hook to) is probably cracked. Remove it and look for cracks on the bottom and sides. If it is cracked replace it.

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My truck has a miss. cutting out real bad on the hwy at higher rate of speed with a load on it especially. I have put new plugs, plug wires, cap and rotor, and air filter on it. the old rotor had an arc...


I would also change the igntition coil if you have not done that already. Have you changed the fuel filter? I would change the fuel filter, if you have a clogged filter thenit may run good at idle and less load conditions but when you call for more fuel during hard excelleration or at highway speeds the engine will not get enough and it will lean fire and buck and miss.

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Hello Need help on a 2004 Ford Explorer. Having problems with Ford explorer rough ideal & missing. Changed plugs & wiring. Used Gas treatment. Change fuel filter & air filter also.


You have an air leak at the intake. Spray a bit of starting fluid around the intake. The engine will respond when you hit the spot. Replace the gaskets as required.

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MY 1993 SUBARU IMPREZA L SOMETIMES LOOSES POWER WHEN TAKING OFF THEN ALL OF A SUDDEN RETURNS TO NORMAL RPM AGAIN.ITS ALMOST LIKE NOT GETTING ENOUGH AIR FLOW OR LOOSING SPARK SOMEWHERE.IVE ALREADY CHANGED...


This sounds more like an electical problem in the fuel delivery system. Check all the connectors on the fuel pump, fuel pump relay plus generally have a good feel and shake of all connectors. A determined effort will find the problem connector is there is one.

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Concentrate on code 1128, which is basically telling you the engine has been running too lean for a while now, so that explains the misfire codes, which is the rest of them. The main causes of those symptoms is usually a vacuum leak, plugged fuel filter (which you've already changed) exhaust leak, Canister purge system malfunction, or a weak fuel pump. By sounds of yours I'd concentrate on vacuum leak & canister purge system. If you have access to a fuel pressure gauge, check fuel pressure just to be sure, but I'm thinking canister purge circuit.

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Start with testing the injectors for pulse. Get a NOID light they sell the at almost any auto parts store remove in get plug from injector and plug the noid light into plug look for constant steady (pulse)lighting of noid light. Check all six injector on your strait 6. If all is good remove parke plug wire on at a time from cap and look for increased shaking and less when it replaced(Make sure to use wire puller with rubber insulation to avoid being zapped by spark from coil) Note cylinder with no difference or change when wire is removed. Those would be the problem cylinders. Then get a compression guage and check all cylinders for compression by removing spark plugs and attaching guage to each cylinders, make a not of each cylinder's reading. NOTE THEY SHOULD NOT BE MORE THAN 10 PSI difference in cylinders. Make note of low compression cylinders if any. If compression is good all around spark plugs are good, good ignition wires and you have good pulse pattern from you noid light. The only other problem is BAD INJECTORS and those would be the ones that didn't change when you took off the wires. I have work on these old cressida alot my self. Good Luck contact me if you need more help and if I solve your problem leave me a FIX-YA comment.

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