Tip & How-To about Dodge Neon

What to do when your vehicle is running rough

Hi, now this tip covers both petrol and diesel injection engines:

If your vehicle is running rough through all running temp range ie it runs rough when cold and at running temp.
The first thing you should do is go out and purchase a fuel line cleaner, now this you pour into the petrol tank and it then cleans all the fuel lines and all the injectors.
You can buy this from most filling stations and car spares shops a good brand to buy would be Red X this i find works better than any other brand, make sure you buy the correct type ie petrol or diesel and then just follow the instructions on the back of the bottle.
You will then need to give your car a good run for at least 30min to ensure it has worked its way around the whole fuel system.

If after doing this your vehicle is still running rough then you need to look at changing things like fuel filter, air filter etc just give your vehicle a good service and then you should find you have solved your problem

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2 Answers

What do you do if you put bio diesal in a 2015 versa


if the engine is a petrol engine , you drain the tank and refill with petrol, you may have to bleed the fuel rail but basically it will run a bit rough to start with until all the diesel is flushed from the system then it will settle down
if it is a diesel engine and it is not performing on the bio diesel mix, drain the tank and replace the filter and refill with regular diesel
it may be a bit rough until the system is flushed
If it runs good just use the tank then refill with regular diesel

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what vehicle are you talking about? Is it carburetor or injection system fitted? Is it petrol engine or Diesel? Looking forward for your reply so we will be able to help you.

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what does the vacuum pump on an 91' f350 (7.3l diesel) run?


Good question. On petrol engines there is a throttle plate that governs the amount of air entering the engine. At idle the throttle is almost completely closed and a result is the a vacuum is created in the inlet plenum. This vacuum is used to control ancillary engine related functions: opening the engine's exhaust gas recirculation (EGR) valve; operating the intake manifold runner (IMR) valve; moderating the fuel pressure regulator (FPR) function; and in governing in-gear duration (automatic transmission) and vehicle functions such as central locking, fuel cap door release and brake servo assist. OK so what has this to do with diesels? Diesels do not have throttles, engine speed is governed by fuel injection volumes. Without an air throttle the diesel engine does not have a vacuum to run the ancillary vehicular functions. Since many of the ancillary devices have already been made to operate with petrol engines it is simpler add vacuum pump to the diesel engine and use the same components to do the same jobs.

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