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What makes my motorhome p30 454 run rough when you plug the mapsencer up I have put a fuel pump and computer and fuel pump relay water temperature sensor cap wires plug

Run decent but no right

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6ya6ya
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Posted on Jan 02, 2017

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  • 124 Answers

SOURCE: rough idling sluggish acceleration

These 4.3L W motors are common for fuel leaking inside the plenum causing them to run rough and smell like raw fuel. The fuel pressure regulator leaks internally, also the injector spider leaks and the two fuel lines feeding the fuel to the spider. You have to remove the plenum and look for the clean spot. Where the fuel leaks it cleans the oil off. Before you try this check your EGR valve. The EGR valves on these get stuck open with carbon and cause a rough idle. Remove it and look for the plunger it is a small round piece that you can push in and out, make sure it closes fully. You can also clean it with carb clean and they make a replacement gasket with a screen in it to keep chunks out of it. Start with the EGR because it is easier. The parts for under the plenum are available at most any parts store. If you have any problems just ask, and if you can not find the parts I will give you part numbers. Let me know what you find I will be back tomorrow.

Posted on Jan 07, 2009

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SOURCE: multiple misfire

it could be in the timing...you might have it checked

Posted on Jan 29, 2009

redbeard00
  • 957 Answers

SOURCE: P0301 - Cylinder 1 Misfire Detected on a 1998 s-10 idles rough

Sounds like a bad fuel injector. Shop would need to run a contribution test to confirm. I must say, good detective work, good luck.

Posted on Apr 29, 2009

  • 218 Answers

SOURCE: fuel pump will not run

THERE IS A FUEL PUMP SHUT OFF SWITCH(INERTIA) ON THE PASSENGER SIDE KICK PANEL.INSIDE CAB UNDER DASH.IT INTERUPTS POWER TO THE PUMP IF U ARE IN A COLLISION.PUSH THE RED BUTTON ON TOP OF IT.IF THAT DOES NOT WORK CHECK FOR POWER IN AND POWER OUT.NO POWER OUT BAD SWITCH.NO POWER IN OTHER PROBLEM

Posted on May 05, 2009

lsteward68
  • 331 Answers

SOURCE: i can get power th the fuel pump when i run a hard wire from the battery to the relay but when i put the relay back in no power to the fuel pump

I have a question. Turn the ignition on you should hear the pump for about 3 seconds. then it should stop. this is normal operation. then when a signal is sent to the ignition that you are going to crank it then it switches on. I can see how this can seem like the pump is not working but after you crank it you should be able to hear the pump for about 1-1.5 seconds after the crank then it will stop. The pump will not turn on until it is told to do so by the computer.

Posted on May 25, 2009

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2 Answers

88 f150 351w forever to start and when it does it runs real rough until I hold gas down for a minute then idle rough but will start right back up unless it sits awhile doesnt want to start back up


There are several possibilities for this problem. A "cold start" sequence is suppose to activate based on water temperature and the signal from the water temperature sensor. This makes the fuel rich and adjusts timing to make the engine run better when cold. It works like a choke only it is electronic.

There may be 2 sensors with one making the dash gauges work and the other doing the engine controls. If not 2, then 1 sensor would do the whole job.

Another possibility is an air leak in the fuel system which makes the system bleed dry overnight. It is far less common on gas engines but happens a lot on diesels.

Some earlier Ford engines from 1984 to I don't know when they stopped on trucks, would use a step-up solenoid on the accelerator bracket that worked off water temperature. Sometimes a bad water thermostat would make the temperature controls malfunction the other way (High idle, clicking, low idle) that would stall and engine as the temperature vary.

Feb 27, 2015 | 1988 Ford F 150

2 Answers

Engine cranks but wont start intermittently


It sounds like 1 of 2 problems or both first the temperature control sensor witch tells the computer the ambient temperature outside and as it gets colder out tells the computer to give more fuel the other thing to check is the throttle position sensor that tells the computer what position the throttle is in those 2 things together are like a choke on a carburetor seeing it fuel injected you can't pump the throttle you will flood it so the computer has to do it hope this works

Oct 15, 2014 | 1997 Dodge Dakota

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When i put key on, engine fans and fuel pump runs on and off repeatedly. sometime i experient severe hard starts. please can someone help. Best regards.


There is a list of things that could cause a hard start, a dirty air filter, fouled spark plug/s, water in the fuel or dirty fuel filter. The relay and fuel pump sounds are normal. Try a temperature sensor made for your vehicle it is possible the wrong sensor has a different draw, it is hard to say without being unable to test it.

Dec 08, 2013 | 1995 Subaru Impreza

1 Answer

Put a new fuel pump in a 2001 blazer. 4.3 vortec. truck will start but idles rough and then stalls. changed fuel filter, cap and rotor, plugs and wires and it made no difference. put it on a scanner and no...


Have you checked the fuel pump relay? I've had to replace the fuel pump in mine a few times now but the relay was one of the problems I had and it was a whole lot cheaper than the fuel pump.

Feb 24, 2013 | 2001 Chevrolet Blazer

2 Answers

Trying to locate fuel pump relay location on the fuse panel under the passenger side dash. I changed the fuel pump and the truck is still running rough. I changed the fuel filter as well. The roughness is...


your problem is not the fuel pump relay, a relay is just a switch it is either on or off so if the pump is working then the relay is working, i can look up the location for you but i need to know the year, make & model. i think your running problem is more likely a bad spark plug or spark plug wire or ignation coil, again if you give me the year , make, model, engine size i can look up some specific test for you car. also check for trouble codes and let me know what they are and i will look them up as well.

Jun 27, 2011 | Ford Expedition Cars & Trucks

1 Answer

Car stalls after sitting a day or two


hello,good day,maybe your fuel pump or fuel pump relay is not working properly,,also fuel filter and fuel nozzle should be check (fuel side) in electrical you have transistor box,spare plug.distributor cap ,rotor also tobe check,ty

Apr 08, 2009 | 1993 Mercedes-Benz 190

1 Answer

1995 blazer was running rough, now not starting


if you believe some one put water or bad gas in your tank, then you will have to drain the tank. however, to know if you have water in your gas, first disconnect fuel return line or the line that goes in to the fuel pressure regulator put some fuel in a clear glass and let it sit for 15min.if you see white cloud at the bottom of the glass or water. drain the tank. if not check for spark by removing one spark plug wire and spark plug. place the spark plug in the spark plug wire boot and touch it on the metal part of the car. do not touch the spark plug itself only the booth with the plug in the boot. have some one crank the car over. if you see spark, the spark part is ok. but if no spark, check the coil with a volt meter it should be 3 to 8 ohm if not replace the coil. if ok, check for fuel by removing one spark plug or two and see if they are wet,if wet pump is ok. if not check the fuel pump relay and fuse. if fuse is blown replace. check relay with a volt meter. resistance of the relay should be between 40 to 80 ohm. not mega ohm,if mega ohm, replace. if not , listen to the fuel pump while some one is cranking the car. if you donot hear the pump, disconnect the pump electrical connector and applive 12 volt and ground to the pump by using a jumper or any wire and listen for pump sound. if not replace the pump. if there is sound coming from the pump, it is ok. check the fuel pressure regulator with a fuel pressure gauge or simply disconnect the vaccum from the regulator and try starting the car. if fuel pump is ok and spark is ok. then it maybe the computer or the crank position signal. also check the fuel filter it may be clog.

Jan 02, 2009 | 1995 Chevrolet Blazer

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