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I was only going to use the octane booster to determine if detonation was the problem. No access to scantool at the moment. If it solved the problem, I was going to use seafoam to clean the tops of the pistons.

Bummer. I was hoping it would raise it about 4 points just to see if it was detonation.

Will pull the plugs. Now that I think more about it, it almost sounds like knocking from detonation, which I believe happens when the engine is really warm. I have a soundbite, but don't know how to load it up. I can forward it to anyone who is interested in hearing it if you would be willing...

Thanks for the replies. Hello Hotrodbuick, Rocker #3 is not loose, it's cycling normally. I used GM lifters with the hardened seat. Comp Cam cam lube and broke it in for 15 minutes at over 3000 rpm. I pulled the intake again afterwards and looked at the lifters, and they looked great. Will...

Replaced the cam and lifters and heads on a 87 turbobuick because of a bad #3 lobe. Also replaced the coilpack, plugs and wires. Finally got the car running smoothly and made some short trips to shake the car out. BLMs 139 at idle, 115 at constant speed, 128 when coasting. Compression...

My brother's Turbo Limited had a tick, so I pulled the driver's side valve cover and sure enough, the #3 exhaust valve rocker wasn't moving much. I tore the engine down and replaced the cam and lifters with a GM cam and GM lifters and put it all back together. Car started up fine and oil...

Anyone out there have one for sale?

SOLUTION FOUND! I thought I better post the source of my problem to add to the archives since none of you came close. A friend of mine who has been working on cars for almost 40 years was able to discover the problem with my car. When the scan tool was attached, he noticed that the car went...

Blocked off the vacuum lines at the vacuum block. BLM and Int still go to 160 in closed loop. IAC is 20 when car is hot. Removed driver's side valve cover to see if there was a bad lobe on the cam as well. Going to get smoke pumped through the system to see if there are any leaks that...

Will try in about two weeks. I will keep you updated.

Used another bottle of propane looking for a vaccum leak. None found so far. When the car is fairly cold, but in closed loop, the BLM and INT values are similar to a reference car, but when it reaches full operating temperature, the BLM and INT pretty much go to 160. If I remember...

Will be able to look at the car Monday. Friend with an 87 T passed his emissions test on the second try. He has an identical setup except he is running a TE44 instead of a TA49. He had to drop the fuel pressure down to 32 psi. HC at 40km/h was 105. Limit was 106. He also had an...

Do not have access to car right now, but will try as soon as possible. I will advise once this is done. Thanks for your help.

I think I set tps at .48. Any other ideas what could be causing a lean condition off idle? Have also tried switching computers.

IAC is set at 100 when engine is at hot idle. TPS has been set for the range as specified on the t type site. Don't know the value at 2000 rpm.

Closed loop, 165 deg water temp. RPMs go above 2000, BLM goes to 160 and INT also works its way up there. o2 values do eventually toggle, but no where near the 200mv to 800mv range they should. Voltage also moves around, can't remember the exact range, but I think the midpoint is around...

The crack is a hairline and can only be seen if you look from the inside out shining a light on it from the other side. I've heard of lots of cars passing with cracks much larger than this one. My emissions get worse as speed increases past 30 km/h. I retested using propane looking for...

Could a K&N valve cover breather be the source of my problems?

Don't have those values because technican did not ask machine for them. Also checked charcoal canister and it seems to be fine. Will concentrate on intake leaks and double check the hoses.

Brake cleaner sprayed on EGR and all connections. Didn't seem to do anything. Engine did not speed up. Fuel pressure levels have been tested at various pressures and values climb as fuel pressure climbs. NOX is low, 86 even though engine temp high. Two new Delco O2's tried, but not...