Check the injectors and make sure there is fire on those plugs in 3 and 4
SOURCE: 1990 Lumina running roung, power loss rough idle
On the chevy v6 engines it real comon to have intake leaks.I would try spraing carb cleaner around the intake while the car is running and see if it changes the way it runs.If it does that is your problem.If the intake has a leak it will **** extra air in and cause a missfire.
SOURCE: 1990 ranger 2.3L runs rough.at idle and when
There will be an egr control solenoid that allows vacuum to reach the egr solenoid, sometimes it will be called the egr vent solenoid. It is probably bad.
SOURCE: Check engine light comes on temporarily - engine chuggs at idle
Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.
SOURCE: hesitates on acceleration
Does the car always hesitate during acceleration? If it ALWAYS struggles when it starts or ALWAYS hesitates on acceleration then I would say the issue is fuel delivery. If the problems are more intermittent and come-and-go then it could be an electrical issue.
I would start by changing the fuel filter. Changing plugs, wires, cap, and rotor are all good things to do as your budget will allow. I doubt you will have to change your injectors.
If you end up replacing any rubber fuel line, be sure to use the high-pressure stuff made for use on fuel injected cars.
I hope this helps! -Nick
SOURCE: Ford F150 engine backfiring, running/idling rough
I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?
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I located the problem. I noticed a bolt missing from the intake manifold on the side where cylinders three and four are located. Once I replaced the bolt, the problem went away and now the engine is running smoothly. Thanks for all the input.
Hi David - I know this was a while ago back in 2013, but my 1990 2.5L YJ is doing this exact same thing. Where exactly was this missing bolt located? I've looked and looked at my intake manifold, and for the life of me I can't see where a missing bolt would be an issue. Is there any way you could send me a pic of the bolt that was missing? To be clear, is this on the driver's side of the 2.5L motor on the intake manifold, towards the back where cylinders 3 and 4 are?
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