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Old 05-31-2010, 07:57 AM
Fanucman Fanucman is offline
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Join Date: May 2010
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Question 1998 2.5L power problems

My 98 has been having power problems for quite some time now. After a compression test and finding very low readings I pulled the engine for rebuild. Found the reason for low readings to be broken comp rings on 2 cylinders. Bored block .030, had crank turned, head shaved, and had valve job done. Put it all back together with new injectors, TPS, IAC motor, and Mass Air Sensor. It runs far better than before. the problem is that it shill has no top end power. Hooked it up to scan tool and at idle it shows the ign timing to be at -3 deg even though a timing light shows +8 - 10 deg at balancer. Checked another 2.5L Ranger with same scan tool and it showed +12 deg ign timing while at idle (did not check this one with timing light). I am old school (don't know much about computer controled engines) but I know that if timing is retarded you get loss of power due to it. I think this is the problem I am having here but don't know how to change the ign timing or why scan tool and timing light would show different values. I can give more detail about problem but didn't want to muddy the waters too much at first. I am really stuck and need some help please.
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Old 09-04-2010, 09:54 PM
Magnis Magnis is offline
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Join Date: Sep 2010
Posts: 17
Default Re: 1998 2.5L power problems

I believe I've had a similar issue like this before. If you haven't found the problem yet then please allow me to make a suggestion. One at a time pull a plug from your coil pack but no further than an inch away from the port you pull it from. If you get current arching across from the pack to the wire then that pack is still running. Then check the other the same way. Odds are one of them isn't getting current. If one coil pack isn't getting current to any of the plugs then continue to read. Now comes the fun part.

Locate your EEC-V under your hood. It'll be on the passenger side in the firewall. You can't miss it, there are a whole bunch of wires goin to it. Pull that out and take the metal covers off and look for fried chips. If it was anything like mine you could smell it the second you pull the box. A replacement at the junk yard should run from 20-50 but you have to make sure the vehicle you pull it off of is the same year and engine. Also check the model number too. If you can't find a ranger in the same year then look for a Mazda b2500 they are the exact same truck. I hope this helps you.
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