# Exhaust Manifold Repair in Upland > Ticking at cold start or exhaust smell under the hood? Route 66 Auto Repair in Upland repairs cracked manifolds, blown gaskets and broken studs. Source: https://route66autorepairshop.com/exhaust-services/exhaust-manifold-repair Updated: 2026-09-17 Business: Route 66 Auto Repair, 1775 W Foothill Blvd, Upland, CA 91786, (909) 608-7699 Hours: Monday to Friday 8 AM–5 PM, Saturday 8 AM–2 PM, Sunday closed **TLDR:** Manifold leaks start as a **cold-start tick**. We confirm the **gasket, stud or crack**, quote the full job in writing, and **call before** any surprise work. A tick that is loudest on a cold morning and fades as the engine warms is the classic sign of an exhaust manifold leak. Route 66 Auto Repair in Upland finds whether the gasket, a stud or the manifold itself has failed, then repairs it properly. Manifold work can hide surprises, so we explain the risks in writing, and if a job grows we stop and call before going further. ## What are the signs of a manifold leak? - Ticking or tapping at cold start that fades when warm - An exhaust or burnt smell under the hood - Black soot near the manifold flange - A missing or loose heat shield bolt rattling at idle - Scorched wiring or melted plastic close to the manifold ## Why do exhaust manifolds crack and leak? The manifold goes from cold to very hot every trip, and it grows and shrinks each time. On trucks and V engines, that movement fatigues the studs until one snaps, and the gasket beside it starts to leak. Long climbs with a load, like towing up the Cajon Pass, add extra heat cycles. Cast manifolds can crack outright, and stainless tube manifolds can crack at their welds. The cabin smell matters here. A leak at the manifold sits close to the fresh-air intake, so fumes can reach you even though the leak is small. If you smell exhaust inside the car, treat it as need-now. ## What if a stud breaks during the repair? Old studs are often rusted into the head, and removing one can take extra steps. We tell you that risk before we start, and if a stud breaks, we stop, explain the options and get your approval. Your written estimate shows every step. Diesel manifold work is covered on our [diesel exhaust manifold repair](https://route66autorepairshop.com/diesel-engine-services/diesel-exhaust-manifold-repair) page. ## Our manifold repair process 1. **Listen cold:** We start the engine cold when possible, since many manifold leaks seal once hot. 2. **Find the failure:** We check the flange, studs, heat shield and the manifold body for cracks. 3. **Quote with the risks named:** Your estimate covers parts, access and the chance of a seized stud. 4. **Repair and recheck:** We fit new gaskets and hardware, torque to spec, then recheck cold and road-test. ## What's included in manifold repair - Cold-start leak check - Stud, flange and gasket inspection - Heat shield and nearby wiring check - New gasket and hardware - Torque to specification - Cold recheck and road test ## How urgent is a manifold leak? **Need now:** - Exhaust smell inside the cabin - Heat damage to wiring or hoses nearby **Need later:** - A faint cold tick with no smell, scheduled soon ## How pricing and timing work Access varies hugely by engine, and seized studs can add time, so we quote after inspection and call if the job changes. AAA members get 10% off parts and labor, up to $75. Manifold jobs may take more than a day when parts must be ordered. For other leaks, see [exhaust leak repair](https://route66autorepairshop.com/exhaust-services/exhaust-repair) or the [exhaust repair hub](https://route66autorepairshop.com/exhaust-services). ## Frequently asked questions ### Is an exhaust smell in the cabin dangerous? It can be. Exhaust carries carbon monoxide, which you cannot smell on its own. If you smell exhaust inside, drive with windows open, avoid idling, and come in soon. Headache or drowsiness means stop and get fresh air. ### How is an exhaust manifold leak found? We listen with the engine cold, because many leaks seal once the metal expands. Then we inspect for soot at the flange, broken studs and cracks. An [exhaust leak inspection](https://route66autorepairshop.com/diagnostics-and-inspections/exhaust-leak-inspection) can be booked on its own. ### Can a manifold leak cause engine problems? A leak near the upstream oxygen sensor can confuse the fuel mixture reading and set a code. Heat from the leak can also damage wiring nearby. Fixing it early keeps the repair smaller. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.