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- May 21, 2012
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Hi all I am helping a friend who bought a 1990 b2600i 2wd with 130k on it two months ago. It sat a bit before he bought it but it drove well for the last month and a half. With the exception that it idled high, hunting, occasionally once warm. So I suggested we replace the temp sender since it's easy and cheap. Along with that we replaced the air filter and it was really dirty.
About 2 weeks after this, he was driving around town and instantly it ran realy rough, smelled rich, and had little power. When cold, it would start and run fine until about 2min later when it tried to idle down then it's rich and rough (raw gas out the exhaust). When it ran good, vacuum was 19", when it ran bad vacuum fluttered at 15" Code 25 for the regulator solenoid, I dismissed it for now because.. The valve cover gasket was leaking bad and possibly oil was pooling at some plugs so we replaced that, and did plugs/wires/cap/rotor while at it. After that it ran great, all the way to warm, and test driving around was perfect. Ran for an hour no problem. We parked it and had a beer.
3 hours later he started it up and the same thing happened. Looking at code25, we bypassed the solenoid hooking the regulator directly to the intake. No change. Disconnect the water temp sensor (hey maybe it's bad) no change. Grounded the regulator solenoid and vacuum went away, so it's doing what it should be doing. Well, since the solenoid is only used when hot, and the truck clearly was not hot, we opted for a pressure regulator (since my test kit was not with me). Replaced that, and it now runs better above 2k rpms (doesn't bog) but it stull runs horrible and rich at idle, and still gives code25.
I'm busting out the dvm and start pinpointing but man what a pain, does anyone have any ideas??
About 2 weeks after this, he was driving around town and instantly it ran realy rough, smelled rich, and had little power. When cold, it would start and run fine until about 2min later when it tried to idle down then it's rich and rough (raw gas out the exhaust). When it ran good, vacuum was 19", when it ran bad vacuum fluttered at 15" Code 25 for the regulator solenoid, I dismissed it for now because.. The valve cover gasket was leaking bad and possibly oil was pooling at some plugs so we replaced that, and did plugs/wires/cap/rotor while at it. After that it ran great, all the way to warm, and test driving around was perfect. Ran for an hour no problem. We parked it and had a beer.
3 hours later he started it up and the same thing happened. Looking at code25, we bypassed the solenoid hooking the regulator directly to the intake. No change. Disconnect the water temp sensor (hey maybe it's bad) no change. Grounded the regulator solenoid and vacuum went away, so it's doing what it should be doing. Well, since the solenoid is only used when hot, and the truck clearly was not hot, we opted for a pressure regulator (since my test kit was not with me). Replaced that, and it now runs better above 2k rpms (doesn't bog) but it stull runs horrible and rich at idle, and still gives code25.
I'm busting out the dvm and start pinpointing but man what a pain, does anyone have any ideas??
