91 L98 engine trouble
Thread Starter
Cruising
Joined: Mar 2009
Posts: 11
Likes: 0
From: Staten Island New York
91 L98 engine trouble
Hey guys my car has about 95,000 miles on it. It started running rough and if I mash the accelerator in any gear it bogs down and wont go past 4500 rpm if I am easy on it it'll go to redline but it sounds and feels rough. All the injectors feel like they are working. I'm thinking the timing or ignition are to blame. Any help would be appreciated thanks.
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
Hey guys my car has about 95,000 miles on it. It started running rough and if I mash the accelerator in any gear it bogs down and wont go past 4500 rpm if I am easy on it it'll go to redline but it sounds and feels rough. All the injectors feel like they are working. I'm thinking the timing or ignition are to blame. Any help would be appreciated thanks.
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 414
From: WV
Could be many things but start with the simple stuff first, when did you last change your fuel filter, air filter, do a tune up??? Petes right, could be the converter, could also be a fuel delivery problem.Also don't rule out it being the injectors, they should first be checked to see if the internal coil is shorting out by checking them with an Ohm meter. If you don't have a Factory Service Manual this is one of the first things you should get, theres a section on trouble shooting that helps you eliminate possible problems one by one. You can usually get one used on ebay fairly cheap, and if your going to keep the car and work on it yourself its a must have item...WW
Last edited by WW7; Dec 11, 2009 at 09:44 PM.
Racer
Joined: Feb 2009
Posts: 252
Likes: 0
From: connersville IN
rent the autozone guage,its $100 but its loan a tool and a nice one.
hook it up and turn the key,if the fuel pressure looks lazy or it bleeds down the fuel is leaking into the cylinders-bad injectors.
If its just a high rpm miss then check for vac leaks and the fuel pressure regulator,if its leaking you should smell fuel.
Last put new ac delco plugs in and gap them right
