1991 missing @ idle- anything on this?
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 1,009
Likes: 62
From: Houston Tx
1991 missing @ idle- anything on this?
Hello everyone, I have a 1991 coupe with 199,700 miles on it. The car has been in the shop recently because it stopped running while I was driving on the freeway. The engine would not turn over @ all. The guy that repaired it for me is a mechanic @ a Chevy dealership. He said the car was water flooded which he said meant that it was flooded with gas. He removed the gas and then said injector # 8 kept shooting gas. He replaced the injector. However, the car has a very noticable miss it in now especially @ idle. I can hear a little of what sounds like the metal rubbing metal. I remember this sound years ago on my 1981 Z28 when I had a timing chain break after a while. I'm trying to figure out if this could be the case now. The car idles very low @ times. I changed plugs, wires, rotor and dist cap. At times the car idles very well but most of the time, the miss is there. Is there a way to determine if indeed the timing chain needs to be replaced without pulling the front of the engine apart? Also, how difficult is it to change a timing chain and gears on a 1991? Thanks.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
What? The mechanic couldn't isolate the miss to a single cylinder? You have a '91, check compression on #7 & #8 (since that's where the injector let loose). Look at those plugs for rust on the threads or an electrode that looks different from the the other plugs. The extra fuel could have blown out at the head gasket at #8 (or done other damage) and #7 is where most of these L98's develop head gasket problems.
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
At 200K miles one injector went bad you could have problems with another. Timing chain on an L98 isn't bad but you will have to pull everything including that balancer to replace.
You have gotten your money out of that engine and when you start throwing parts at it you could be throwing good money after bad. This is just my opinion but if the car is in good shape you may want to look at cheap crate engine. You will be way ahead of the game doing it now.
As I wrote...Just my $.02
You have gotten your money out of that engine and when you start throwing parts at it you could be throwing good money after bad. This is just my opinion but if the car is in good shape you may want to look at cheap crate engine. You will be way ahead of the game doing it now.
As I wrote...Just my $.02
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
As you can tell from my avatar I didn't leave the stock engine in too long
If you can't fit the puller in there you can easily lift up the engine a bit but don't forget to pull the distributor if you do, many caps have been broken by forgetting this
Burning Brakes
Joined: Jun 2008
Posts: 892
Likes: 1
From: New Smyrna Beach Florida
You should have changed ALL your injectors while you had the chance.
check this site like everyone else:
http://fuelinjectorconnection.com GREAT PRICE, Jon, GREAT GUY
If you can save your present engine, this is a "must do" because the ethanol in the fuel is eating up your injectors.
check this site like everyone else:
http://fuelinjectorconnection.com GREAT PRICE, Jon, GREAT GUY
If you can save your present engine, this is a "must do" because the ethanol in the fuel is eating up your injectors.
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 1,009
Likes: 62
From: Houston Tx
1991 missing @ idle- anything on this?
Here's the latest on my 91.
I had a Corvette speciality mechanic in Houston diagnois the engine. He found low compression in #s 5 and 7. The compression was approx. 30% less than the other cylinders. His thoughts that this is not bad for a car this old and with this number of miles on it. However, he warned that if I did a head job on it, the car would probably burn a ton of oil. Also, he found a couple more injectors about to go out and the timing chain loose. It has about 20 degrees of play in it. With that said, I'm trying to figure what to do next. I've had quotes ranging from $4,500 to $6,000 to rebuild the engine. Needless to say, this is quite expensive. Any suggestions?
I had a Corvette speciality mechanic in Houston diagnois the engine. He found low compression in #s 5 and 7. The compression was approx. 30% less than the other cylinders. His thoughts that this is not bad for a car this old and with this number of miles on it. However, he warned that if I did a head job on it, the car would probably burn a ton of oil. Also, he found a couple more injectors about to go out and the timing chain loose. It has about 20 degrees of play in it. With that said, I'm trying to figure what to do next. I've had quotes ranging from $4,500 to $6,000 to rebuild the engine. Needless to say, this is quite expensive. Any suggestions?
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Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
Here's the latest on my 91.
I had a Corvette speciality mechanic in Houston diagnois the engine. He found low compression in #s 5 and 7. The compression was approx. 30% less than the other cylinders. His thoughts that this is not bad for a car this old and with this number of miles on it. However, he warned that if I did a head job on it, the car would probably burn a ton of oil. Also, he found a couple more injectors about to go out and the timing chain loose. It has about 20 degrees of play in it. With that said, I'm trying to figure what to do next. I've had quotes ranging from $4,500 to $6,000 to rebuild the engine. Needless to say, this is quite expensive. Any suggestions?
I had a Corvette speciality mechanic in Houston diagnois the engine. He found low compression in #s 5 and 7. The compression was approx. 30% less than the other cylinders. His thoughts that this is not bad for a car this old and with this number of miles on it. However, he warned that if I did a head job on it, the car would probably burn a ton of oil. Also, he found a couple more injectors about to go out and the timing chain loose. It has about 20 degrees of play in it. With that said, I'm trying to figure what to do next. I've had quotes ranging from $4,500 to $6,000 to rebuild the engine. Needless to say, this is quite expensive. Any suggestions?
It depends on what you want with the car, to just throw out recommendations without knowing that is just plain silly.
A 383 crate is more expensive and based upon your original direction I assume that you want to do this on a budget. You can get a GMPP crate 350 from jegs, summitt, or just ebay for under $2K. If you are competent and have space for another couple of hundred you can get good stands and a cherry picker to do the job yourself.
Labor kills you on cars as old as ours so if possible doing your own labor is the only way to go.
You don't need links, just search 350 crate motor and you will be good to go
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 1,009
Likes: 62
From: Houston Tx
Has anyone used the blue demon pearl injector from the Fuel Injector Connection? I'm thinking of it or the Bosh EV1 High Impedanace injector for my 1991. Any suggestions? Thanks.
Safety Car
Joined: Jan 2006
Posts: 3,566
Likes: 4
From: Mt Laurel NJ
St. Jude Donor '06-'07
Try this:http://paceperformance.com/index.asp...D&ProdID=22861
Just have your heads rebuilt, and you should be good to go.
Just have your heads rebuilt, and you should be good to go.
