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  #1  
Old 09-02-2009, 06:23 PM
tamochin tamochin is offline
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Default 1999 ranger power loss

I have a 1999 ford ranger 3.0l runs fine when engine is cold but once it gets up to temp it loses alot of power and iI get constant spark knock. Any help?
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  #2  
Old 09-02-2009, 08:26 PM
02'4.04x4 02'4.04x4 is offline
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Quote:
Originally Posted by tamochin View Post
I have a 1999 ford ranger 3.0l runs fine when engine is cold but once it gets up to temp it loses alot of power and iI get constant spark knock. Any help?
Hmm, Fuel Pump would be the first thing I would check / replace.
the reason being; yadda, yadda, cold, yadda, management, yadda, fuel, yadda, yadda, warm, yadda, yadda, different, yadda.
HTH G/L

Last edited by 02'4.04x4; 09-02-2009 at 08:29 PM. Reason: Quick reason why.
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  #3  
Old 09-02-2009, 08:36 PM
DieHard4rd DieHard4rd is offline
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Check your air filter.
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  #4  
Old 09-03-2009, 12:05 AM
02'4.04x4 02'4.04x4 is offline
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Quote:
Originally Posted by SNOWBALL09 View Post
Check your air filter.
Holy Poo, if he is right you need to join a car club. . . . .
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  #5  
Old 09-03-2009, 05:33 PM
tamochin tamochin is offline
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Thanks for the suggestions. It's not my air filter, checked it, even took it out. ummmm fuel pump and yada, I think not.

I lose about 1/3 of my power when the engine get to temp. The constant pinging, spark knock or preignition? I pull the plugs and they look good. Does my timing change with engine temp??
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  #6  
Old 09-03-2009, 06:25 PM
02'4.04x4 02'4.04x4 is offline
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slightly, but it would'nt be good one minute and not the next repetitively and consistant.
Well I guess I am going to have to tell the tale of why I recommended what I did to help another guy out.

Fuel mapping is different for cold vs. warm it is richer when it is cold, and it leans out when it is warm. Therefor it is typical for a failing fuel pump when you first start the engine it runs seemingly normal and then once the computer switches maps you get running issues like irratic idle and significant power loss. . . . . Like I said Yadda, Yadda, Yadda. Good luck with the timing though since you think not.

Last edited by 02'4.04x4; 09-03-2009 at 06:34 PM.
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  #7  
Old 09-05-2009, 04:30 PM
tamochin tamochin is offline
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once again I dont buy into the feul pump. My air fuel mixture is not derived from the fuel pump. Its just a pump that delivers gas to the injectors at a certain psi. Rich mixture= less air in fuel and lean = more air in fuel same amount of fuel both cases just more or less air. I,m starting to lean twards a partially plugged cat. That explains the ping because the engine is not asperating properly
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  #8  
Old 09-05-2009, 04:59 PM
tamochin tamochin is offline
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you might be on to something with the fuel pump. I've done some additional research and I'm gonna test it.
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  #9  
Old 09-05-2009, 05:49 PM
02'4.04x4 02'4.04x4 is offline
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I wish you the best with it, but I can tell you that you really do not understand how vehicles work and it would probably be best if you got someone to help you. G/L
e.g. how is the air fuel mixture not derived from the fuel pump if the pump is not working. . . . .
Also thanks for the lesson on mixtures.

You might be on to something, It seems totally apparent that a clogged cat would cause the fuel to vary. Do you know why a motor makes the pinging sound?. . . . .

Last edited by 02'4.04x4; 09-05-2009 at 05:54 PM.
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  #10  
Old 09-06-2009, 08:17 AM
tamochin tamochin is offline
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ok 4x4 now you have eritated me. First of all I've attended 2.5 years vocational automaotive. I was a state finalist in the plymouth trouble shooting contest and have worked 2 years as a certified automotive tech. This was back in the 80's. Having been out of that field for almost 30 years and my certification has long since expired, I still comprehend alot more than you realize. I also understand that alot has changed with autos in that amount of time. But for you to tell me its my fuel pump, tell me its not working and insult me to boot, you are way out of line. I assure you that my fuel pump is working. The only way that my fuel pump is the culprit is if it is pushing to much pressure, this is rare but it does happen and I gave you the benefit of the doubt.

about preignition, most common cause is carbon build up, it glows red and causes the air fuel to pre detonate. An other reason, is poor timing, not so common these days. The timing is to advanced and same result preignition. You never thought for a second I might have a bad o2 sensor or egr valve? These 2 things can give me the same symptoms. I'm looking to bounce some ideas off some people, not, its your fuel pump yada yada. Is that tech talk????? That engine is not lacking fuel. It does not have erratic idle, it does not surge when driving. These are symptoms of a bad electronic fuel pump. If your method of diagnostics consist of fixating on one particular thing and just replace a part and cross your fingers and see what happens. then you advice I'm not looking for. I'd rather hear advice like, it might be this and this is what you need to do to test it. I havnt pulled any codes yet, and I intend to do so this week, you havnt even mentioned that I should do that very thing. You just say its you fuel pump yada, fuel mapping yada. Your a joke in my opinion. Is there anyone here in this forum with true diagnostic advice??? Its not you. Just because you helped someone in the past with fuel pump issues it does not mean that I have fuel pump issues. And I will not just change a part without testing it first. So run along with your fuel pump theory, your kind of advice I do not need.
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  #11  
Old 09-06-2009, 09:56 AM
02'4.04x4 02'4.04x4 is offline
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Well allright. My intentions are not to irritate you or insult you (allthough It did feel odd having the fuel pump dismissed like that)but to bring to light that you are missing alot. Whether or not you have attended 2.5yrs. of school or not, your thoughts were aloof. Bad 02 causing this, no, EGR, not this consistant of good/bad. Hmm 1980 I don't even think F.I. would have made into school by then. We were still racing 4bbl. and I do so love them. About preignition the MOST common cause is bad gas. The "computer" advances the timing to compensate. . . Hmm, fixating. . . no not the case, when TS'ing a vehicles the problems often point in a direction. But without all the facts it is very hard to draw a final conclusion, engine size, management type, ign. type, etc. Anyways I am truely sorry for irritating you and please understand that my saying that you should get someone to help you was strictly with your best interest in mind, I will bow out of this and I wish you the Best of Luck.

P.S. I would recommend that you check to see if the EGR valve is stuck closed. Simply remove it and clean it. The symptoms are not as concrete as your discription and the power loss is not usually that significant. But in all fairness this is the proper recommendation for your sitchee-ashun in reference to the EGR valve.

Last edited by 02'4.04x4; 09-06-2009 at 10:58 AM.
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  #12  
Old 09-06-2009, 10:58 AM
02'4.04x4 02'4.04x4 is offline
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Just posting to bump, Read above.

Also just for the record. I never said run out and replace your fuel pump. That is where I recommended you start your TS'ing. I am not implying I know everything about cars, I do not, I do however have a great deal of experience related to engines and the occasional things that screw with them I have experienced from stock to HOT. This is all I can offer to anyone. I am sure there are guys with alot more experience on this site. Now with that being said it is a free site, all about newbies getting help and chatting with more experienced guys about all kinds of things. Any advice is offered to assist you in saving money and learning about your vehicle. I would hope that in your wealth of VoTech training that is a two year course, they would have explained a methodology about TS'ing like air, spark, fuel, and so on from there. You know, start with the basics. It seems all to often that guys who ask for advice on some of the simplest things and get smart often end up saying that they are Mr. Goodwrench himself, ironic it seems. So just keep in mind that all these guys are just trying to help and keep an open mind that it's possible the reason you cannot diagnose it yourself, might just be because you do not know something.
Just a thought. . .

Last edited by 02'4.04x4; 09-06-2009 at 12:50 PM.
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  #13  
Old 11-26-2010, 11:04 AM
pjdwhitney pjdwhitney is offline
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Default Re: 1999 ranger power loss

sounds to me you may have accesive back pressure caused by a restricted cat converter.should not have over 3 psi before the cat using a back pressure tester
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  #14  
Old 11-26-2010, 07:55 PM
Lonncarr Lonncarr is offline
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Default Re: 1999 ranger power loss

mine did the same thing and I did the Seafoam in the brake booster vacuum line and it cleared right up.
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  #15  
Old 12-01-2010, 06:43 PM
joker515 joker515 is offline
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Default Re: 1999 ranger power loss

how low of octane gas are you using? if its lower than say, 90, try using an octane booster... that could be causing the pinging... my 2cents
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