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Car Forum / Oldsmobile Cars / November 2003'87 delta 88 royale cruise problem.
Some other questions as well, but first the cruise. I just got a 87 delta 88 royale from an uncle. I know he was the 2nd owner and he and the previous owner took good care of it, it only has 76K miles on it currently. 3.8v6 Anyway while the garage has called the cruise third party it really does not look it. The control is integrated into the wiper and turn signal stalk, and the mountings within the engine bay look stock as well. Anyway the cruise "works" it will hold the car at speed but it feels like it is doing it by flooring it then coasting repeativly. Does anyone know of a way to fix this or at least check the problem? Also the dipstick calls for dextron 2, is it detrimental to use dextron 3 or are they the same thing? It has no drivablity problems but the engine idle is a little rough and sometimes it seems to be missing a bit, I know the plugs have been changed and I was wondering if there was any obvious thing I might check. I know the O2 sensor is in good working order and it has within the last few months passed the computer checks and such after having a control module replaced(I need to check the recipts again but my uncle had them from everything he did). Thank you T.C. Modern Dexron fluid is considered a desirable substitute for previous iterations of the fluid. As for the cruise, I'm assuming the cruise system (whether OE or aftermarket) uses a vacuum bellows (servo) linked by a chain or rod to the throttle arm. The servo's vacuum input would be modulated by a transducer (usually mounted on the driver's fenderwell in OE installs) that receives a speedo cable in from the trans and another cable out to the gauge cluster. If this describes your system, my first guesses include: bad vacuum lines, kinked speedo cable, wrong speedo cable, bent cable tip, bad speedo gearset in trans tailshaft (is the speedo reading stable?), or binding somewhere in the throttle/servo linkage. Beyond that it may be time to test the functionality of the transducer and its electrical connections. Before delving into transducer/electrical diagnosis, be *certain* you are dealing with OE equipment. Compare your cruise parts to other 88s with known OE systems if necessary. If the cruise is third party as your dealer asserts, it's very possible that nothing is wrong and you just have a piece of crap "on/off" setup (i.e., JCWhitney special). As for poor idle, driveability issues related to the emissions and ECM systems can be quite frustrating to chase on these cars, particularly if this is an E4MC/E (computer controlled) QuadraJet setup (I don't think TBI was available on that application). Before looking into that, it is advisable to do/check the standard stuff: change your filters, check the distributor cap/rotor, plug wires, vacuum leaks (*very common) either via rotten/misrouted hoses or bad intake/carb gaskets or worn throttle shafts, etc. Maybe run a compression test to make sure the longblock is okay. Perhaps the carb should be rebuilt...the list goes on. Best of luck... > Some other questions as well, but first the cruise. I just got a 87 > delta 88 royale from an uncle. I know he was the 2nd owner and he and [quoted text clipped - 21 lines] > > T.C. > As for poor idle, driveability issues related to the emissions and ECM > systems can be quite frustrating to chase on these cars, particularly [quoted text clipped - 6 lines] > make sure the longblock is okay. Perhaps the carb should be > rebuilt...the list goes on. Best of luck... Thank you for your information. Oh, 3.8L V6, MFI and distributerless. As far as I can tell its fully computer controlled. But thank you. tc Whoops, 198*7*, crap. Yeah, I was thinking of the fullsize B-body. That sucker woulda probably had a 307 and either TBI or a computer carb. So no, it won't be nearly as much a PITA to chase driveability. Still check for vacuum leaks, and assure all the weatherpack connectors are tight, try a little TB cleaner down her throat for starters. With any luck the idle bypass is just gunked up. I don't believe I've ever poked at the CC setup on your car; my info could be completely misleading. Apologies. >> As for poor idle, driveability issues related to the emissions and ECM >> systems can be quite frustrating to chase on these cars, particularly [quoted text clipped - 11 lines] > > tc As far as the weird operation of the cruise control, in addition to what has been previously said (binding servo, etc), check out the vacuum hose that goes from the cruise servo (you'll find it right under the MAF sesor mounted to a bracket on the fender) to the vacuum pipe assembly behind the throttle body./. Those hoses take a beating from engine heat and they may "look" fine but can end up porous as a piece of swiss cheese (been there, done that on my 87 Olds 98). First thing I'd check for the rough idle is air leaks. Actually, if the cruise control hose is leaking, IT could be the cause of the bad idle! Anyway, check the hose between the MAF and the throttle body for possible craks and leaks, the fitting of the pipe to the valve cover (PCV air intake) and the hose to the PCV valve (in the intake manifold between the #1 and #3 fuel injector). Any air that gets into the engine past the MAF sensor the computer cannot "see" and will have problems compensating for it, which can cause a bad idle. When all is said and done, do NOT expect the 3.8L in that car to idle as smooth as a later balance-shaft 3.8L or a V-8 - it ain't going to happen. Even with an even-fire crankshaft, a 90 degree V-6 has some natural unbalance that will affect the idle (why do you think GM put the balance shaft in the 1988 and later 3.8s?). The 3.8 in the 86 and 87 models is somewhat of a "transistion" model - has most of the nice goodies like MPFI, DIS and a roller cam but lacks that final item - the balance shaft, that makes the 3,8L such a nice engine. Regards, Bill Bowen Sacramento, CA >Whoops, 198*7*, crap. Yeah, I was thinking of the fullsize B-body. That sucker >woulda probably had a 307 and either TBI or a computer carb. So no, it [quoted text clipped - 19 lines] >> >> tc |
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