2.9 ford ranger misfires at cruise.

[duke33]

To start with, this is a cool sub-forum. Here's my problem. My old (86) truck motor had a blown head gasket so I had the local mech swap out with another motor I had bought. Used. Now it runs good while giving it the gas, but while coasting it misses bad. It does idle smooth, kinda wants to "load up" sometimes. I just don't want to go buying plugs, filters, pump whatever if it may be something simple. Any thoughts motorheads?

 

[royal0014]

Re: 2.9 ford ranger misfires at cruise.

Fuel injector


<<)))(((>>

 

[dolluper]

Re: 2.9 ford ranger misfires at cruise.

Check for codes.....just a guess .....carb vent solenoid.or hose going to it

 

[duke33]

Re: 2.9 ford ranger misfires at cruise.

I like the injector idea. I don't think it has a carb vent. Can an injector be manually inspected and cleaned or are they a sealed unit?

 

[MH Hawker]

Re: 2.9 ford ranger misfires at cruise.

lol put some sea foam through it should clean it right up. Best stuff I have found for fuel systems

 

[MTboatguy]

Re: 2.9 ford ranger misfires at cruise.

Fuel injection problem, I have been through it a couple of times now, try the sea foam or an injector clearer. you can do as I did, pick up a new set of injectors for about $100 and have them installed, works out real nice. Ebay is your friend, when it comes to auto parts.

 

[Fleetwin]

Re: 2.9 ford ranger misfires at cruise.

Ooooh, the 2.9L is an old girl.

It was a very simple system, yet EEC 4.

The things to look at are:

1. Plugs.

2. MAF (mass air flow sensor)

3. Injectors.

Look at the plugs, any of them real clean? If so, you may have a head gasket issue.

The 2,8, 2.9, 4.0 engines are a bear to add coolant to. You really need to be:

1. Very patient-add-burp-add-burp-on and on.
2. Invest in having the system vacuum filled.

 

[duke33]

Re: 2.9 ford ranger misfires at cruise.

Thanks guys. I'm gonna try the seafoam. Start with the "easy" fix and go from there. No way to check which injector may be bad??

 

[markheck1]

Re: 2.9 ford ranger misfires at cruise.

I had an '86 Jimmy with a 2.8 V6 that did EXACTLY that,
It was a bad plug wire, FWIW

 

[duke33]

Re: 2.9 ford ranger misfires at cruise.

I'm gonna replace the wires too. Thanks.

 

[duke33]

Re: 2.9 ford ranger misfires at cruise.

Seafoam did it! That ole gal purrs like a kitten! I am now a firm believer in seafoam! Thanks for all the help guys.