LS1TECH - Camaro and Firebird Forum Discussion - LT1-LT4 Modifications

lt1 no start when hot

SAINTZ — Mon, 18 May 2026 19:45:09 GMT

lt1- cammed, new injectors, new spark plugs, aftermarket spark plug wires, new starter, new battery.

Car cold starts perfectly fine, runs/drives fine as well. If the car is left running for longer than 20 min and shut off (or stalled) car will not turn on until it cools off for about half an hour.
It will continue to crank, Getting a jump from another car doesnt help. Ive had this car for just over a year and it has always done this.

Overheating at idle

Q1king — Sun, 17 May 2026 22:06:39 GMT

Hi all,

I recently bought a �97 Trans Am, and it�s been running fine overall. I replaced the thermostat, flushed and refilled the coolant, and properly bled the system. However, it has started overheating at idle or when stopped at a light. On the highway, it stays at normal operating temperature with no issues.

This just started today. It�s about 90F outside, and every other time I've driven it, it's been a cooler day.

Any help or advice is appreciated.

Opti Spark Delete GM#12367600

Fastwagon — Sun, 10 May 2026 23:43:11 GMT

I'm in need in 1 of these if anyone has one to sell or could give me specific dimensions bolt holes drawing sizing I'll make it, thank you in advance.

Manual engine wire harness converted into automatic 95 camero lt1 help

Miro3900 — Tue, 28 Apr 2026 05:26:53 GMT

Im working on a 95 camero v8 automatic the wire harness for the engine was butchered and rigged up so I came across an other camero at pick n pull and took the harness off that one to swap it over to the camero im fixing as im comparing the two the new harness is missing the transmission plug because I guess it was a manuel transmission so what im trying to do is add the transmission plug wire over 2 the harness of the manual harness I unpinned the plug and repinned it but there were some places we're the wire slot was already occupied by the a wire already I dnt know what to do from here so if anybody with the knowledge to bless me with the proper steps to complete this task switching a automatic plug to a manual harness for the automatic car of the 95 camero v8 lt1

Water temp sensor when plugged in makes car run worse

Loweredfbody — Mon, 27 Apr 2026 03:23:29 GMT

Bought the car non running got it running pretty smooth but I've always felt the car was sluggish and slow but never stalled or had trouble idling I was going over the car again when I realized that sensor wasn't plugged in so naturally I plugged it in and it idles way worse odly enough past 2000 rpm that car feels amazing great power no misfire but anything below that it falls on its face and will try to stall out if the throttle is not held wide open.

The car is a 93 firebird formula with a stock lt1